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class=\"w-full flex-1 h-full\">\n\u003Cdiv class=\"w-full rounded-md border border-teal-900\u002F60 bg-white p-8 h-full\">\u003C!-- Icon -->\n\u003Cdiv class=\"mb-4 inline-flex h-10 w-10 items-center justify-center rounded-sm bg-emerald-500\">\u003C!-- simple file icon --> \u003Csvg viewBox=\"0 0 24 24\" class=\"h-6 w-6 text-white\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\">\n        \u003Cpath d=\"M14 2H7a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V8z\">\u003C\u002Fpath>\n        \u003Cpath d=\"M14 2v6h6\">\u003C\u002Fpath>\n      \u003C\u002Fsvg>\u003C\u002Fdiv>\n\u003C!-- Title -->\n\u003Ch3 class=\"mb-3 text-xl font-semibold text-teal-900\">Free downloads\u003C\u002Fh3>\n\u003C!-- Links -->\n\u003Cul class=\"space-y-2\">\n{{#if downloads }}\n{{#each downloads}}\n\u003Cli>\u003Cstrong>\u003Ca href=\"{{value}}\" class=\"inline-block border-b border-current text-emerald-600 hover:text-emerald-700\" target=\"_blank\" rel=\"noopener\" draggable=\"false\"> 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target=\"_blank\" class=\"group relative block w-full h-full rounded-xl border border-emerald-400 bg-[#f6f3ea]\n         p-8 transition-all duration-200 ease-out\n         hover:-translate-y-1 hover:shadow-lg\" draggable=\"false\">\n\u003Cdiv class=\"relative z-10 grid grid-cols-1 gap-6 md:grid-cols-12\">\u003C!-- LEFT CONTENT -->\n\u003Cdiv class=\"md:col-span-8\">\u003C!-- Icon -->\n\u003Cdiv class=\"mb-4 inline-flex h-10 w-10 items-center justify-center rounded-sm bg-emerald-500\">\u003C!-- document icon --> \u003Csvg viewBox=\"0 0 24 24\" class=\"h-6 w-6 text-white\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\">\n          \u003Cpath d=\"M14 2H7a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V8z\">\u003C\u002Fpath>\n          \u003Cpath d=\"M14 2v6h6\">\u003C\u002Fpath>\n          \u003Cpath d=\"M9 13h6M9 17h6\">\u003C\u002Fpath>\n        \u003C\u002Fsvg>\u003C\u002Fdiv>\n\u003C!-- Title -->\n\u003Ch3 class=\"mb-3 text-xl font-semibold text-teal-900\">Download our {{linked.service_name}} checklist\u003C\u002Fh3>\n\u003C!-- Copy -->\n\u003Cp class=\"text-md leading-relaxed text-teal-900\u002F90\">Our checklists are crafted to provide you with all the essential information for preparing your project, to ensure things run smoothly on the day of testing, and to give you the best chance of first-time success.\u003C\u002Fp>\n\u003C\u002Fdiv>\n\u003C!-- RIGHT DECORATION -->\n\u003Cdiv class=\"relative hidden md:col-span-4 md:block\">\u003C!-- teal pill --> \u003Cspan class=\"absolute right-16 top-8 h-24 w-12 rounded-full bg-teal-400\" aria-hidden=\"true\">\u003C\u002Fspan> \u003C!-- outlined pill --> \u003Cspan class=\"absolute right-6 top-0 h-36 w-16 rounded-full border border-white\u002F80\" aria-hidden=\"true\">\u003C\u002Fspan> \u003C!-- yellow dot --> \u003Cspan class=\"absolute right-4 bottom-6 h-4 w-4 rounded-full bg-yellow-400\" 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class=\"et_pb_column et_pb_column_1_2 et_pb_column_9  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_text et_pb_text_4  et_pb_text_align_left et_pb_bg_layout_light\">\n\u003Ch2 class=\"et_pb_text_inner tt-font\">\u003Cstrong>Frequently asked 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is background ventilation testing?","Background ventilation testing is a service used to assess whether a dwelling has enough background air provision for healthy ventilation, usually without relying only on assumptions or product brochures. In new-build and replacement-window work, that often means verifying the correct equivalent area and installation of background ventilators. In retrofit, it more often means the IAA \u002F TrustMark-approved dwelling assessment used to judge whether existing infiltration is sufficient or whether extra background ventilators are needed after energy efficiency works.",[],{"id":345,"question":400,"answer":401,"tags":402},"Is background ventilation testing the same as trickle vent testing?","Not exactly. Trickle vent testing usually sounds like checking whether the window vents are present, sized correctly and installed properly, while background ventilation testing is broader. Part F allows background ventilation through trickle ventilators or other appropriate ventilators sized by equivalent area, and the retrofit-style background ventilation assessment looks at the dwelling’s overall background ventilation performance, not just one vent in isolation.",[],{"id":346,"question":404,"answer":405,"tags":406},"How is background ventilation testing different from ventilation flow rate testing?","Background ventilation testing is about the passive provision of outdoor air into the dwelling, while ventilation flow rate testing is about the measured airflow of mechanical fans and systems. Part F requires mechanical airflow measurement for intermittent extract, MEV and MVHR systems, but background ventilators are sized by equivalent area and verified differently. In simple terms, one checks the passive air-in route; the other checks the powered air-movement route.",[],{"id":347,"question":408,"answer":409,"tags":410},"How is background ventilation testing different from air pressure testing?","It is related, but it is not the same thing. Standard Part L airtightness testing is an energy-compliance pressure test typically reported as air permeability at 50Pa, while the IAA \u002F TrustMark background ventilation assessment for existing dwellings uses dwelling-level air-change evidence at 4Pa to help decide whether background ventilator upgrades are needed. The equipment can overlap, but the purpose, thresholds and reporting logic are different.",[],{"id":348,"question":412,"answer":413,"tags":414},"Why is background ventilation important?","Background ventilation matters because it provides the low-level fresh air that helps dilute indoor pollutants and moisture between purge events and fan boost periods. Approved Document F is clear that inadequate ventilation can contribute to mould and indoor air pollution, and it sets background-ventilation standards as part of the route to meeting requirement F1. On real projects, this is not just a comfort issue; it is a health, condensation and compliance issue.",[],{"id":349,"question":416,"answer":417,"tags":418},"Is background ventilation testing a legal requirement?","Not as a single universal standalone test in the way Part F fan flow-rate testing is for mechanical systems. What the regulations require is adequate ventilation, and Part F gives sizing, inspection and replacement-window guidance for background ventilators. The IAA \u002F TrustMark background ventilation assessment is an optional recognised process used mainly on existing dwellings and retrofit jobs where the team wants evidence that extra background vents are or are not needed.",[],{"id":350,"question":420,"answer":421,"tags":422},"When is background ventilation testing most useful?","It is most useful before or after energy-efficiency works on an existing dwelling, after window replacement, or where a retrofit team wants evidence instead of defaulting straight to more trickle vents. It is also useful on awkward projects where existing ventilation is unclear or where condensation risk, resident complaints or PAS 2035 evidence are driving the brief. The main value is that it can influence the strategy before the wrong solution gets locked in.",[],{"id":351,"question":424,"answer":425,"tags":426},"Is background ventilation testing mainly for existing dwellings and retrofit?","Yes, that is where the service is most commonly used. Approved Document F already provides standard equivalent-area guidance for new dwellings, but the IAA \u002F TrustMark background ventilation assessment is specifically framed around existing dwellings and is recognised in retrofit design guidance for determining whether background ventilation upgrades are required. That is why the strongest search intent is usually retrofit, window replacement and existing-home upgrades rather than standard new build.",[],{"id":352,"question":428,"answer":429,"tags":430},"Does background ventilation testing help with PAS 2035 retrofit projects?","Yes. TrustMark describes the IAA process as a TrustMark-approved approach to measure and address background ventilation requirements under PAS 2035 pathways, and TrustMark’s 2023 retrofit design guidance recognises the IAA background ventilation assessment as a route for deciding whether background ventilation upgrades are needed. In practical terms, it gives Retrofit Coordinators and Designers evidence instead of guesswork.",[],{"id":353,"question":432,"answer":433,"tags":434},"Can background ventilation testing also be used for conversions and extensions?","Yes, it can. Elmhurst’s published guidance says background ventilation testing is usually used for PAS 2035 retrofit work but can also be used for conversion or extension work, and Approved Document F also contains specific existing-dwelling guidance for replacing windows, adding habitable rooms and adding wet rooms. That makes it a useful service wherever the existing dwelling ventilation picture is changing and needs evidencing.",[],{"id":354,"question":436,"answer":437,"tags":438},"What is background ventilation under Part F?","Background ventilation is the purpose-provided low-level ventilation that supplies outdoor air to the dwelling between purge opening and extract events. In current Part F guidance for dwellings, it normally means trickle ventilators or wall ventilators sized by equivalent area, working alongside purge ventilation and extract ventilation. It is one part of the overall ventilation strategy, not the whole strategy on its own.",[],{"id":355,"question":440,"answer":441,"tags":442},"What counts as a background ventilator?","A background ventilator is a purpose-provided ventilator intended to give low-level continuous air supply, typically a trickle ventilator in a window or a wall ventilator. England’s official Part F FAQ is explicit that a wall-mounted background ventilator can be an acceptable route to compliance if it provides the required equivalent area. What matters is the performance and location, not whether the vent sits in the frame or the wall.",[],{"id":356,"question":444,"answer":445,"tags":446},"What is equivalent area?","Equivalent area is the Part F measure used to describe the aerodynamic performance of a background ventilator. It is not just the hole size; it is the area of a sharp-edged circular orifice that would pass the same volume of air under the same pressure difference as the ventilator being assessed. In Approved Document F, background ventilators are sized in mm² equivalent area, not free area.",[],{"id":357,"question":448,"answer":449,"tags":450},"Is equivalent area the same as free area?","No. Approved Document F says background ventilators are expressed by equivalent area, not free area, and that distinction matters. Free area is a simple geometric opening measure; equivalent area is a performance-based airflow measure. On site, mixing the two up is one of the easiest ways to under-size vents and still think the job is compliant.",[],{"id":358,"question":452,"answer":453,"tags":454},"Why must the equivalent area be marked and visible?","Because Building Control and installers need to be able to verify what has actually been fitted. Approved Document F in both England and Wales says background ventilators should have the equivalent area marked where it is easy to see from inside the dwelling when installed. In practical terms, visible marking is what stops site teams having to guess whether the vent in front of them is the right one.",[],{"id":359,"question":456,"answer":457,"tags":458},"Can wall vents be used instead of trickle vents?","Yes. England’s official Part F FAQ says ventilation can be provided through any appropriate means, and a wall-mounted background ventilator that provides the required equivalent area can be an acceptable route to compliance. That is useful where frame vents are undesirable, impractical, or acoustically awkward, provided the wall vent is properly sized and positioned.",[],{"id":360,"question":460,"answer":461,"tags":462},"If I already have a wall ventilator, do I still need more when replacing windows?","Not necessarily. England’s official Part F FAQ says that when replacing a window in a room where there is already a wall ventilator that meets the minimum equivalent area in Approved Document F, no further background ventilation needs to be added after the window replacement. The key is whether the existing wall ventilator genuinely meets the required equivalent-area standard.",[],{"id":361,"question":464,"answer":465,"tags":466},"Is a window on the night-latch an acceptable background ventilation solution?","No. England’s official Part F FAQ says a window locked slightly ajar on the night-latch is not an appropriate background ventilation solution. The reason is straightforward: it is not considered a sufficiently secure means of background ventilation. This is a common misunderstanding on window jobs, and it is not a compliant substitute for a real background ventilator.",[],{"id":362,"question":468,"answer":469,"tags":470},"Do combustion air vents count as Part F background ventilation?","No, not automatically. England’s official Part F FAQ says permanently open air vents serving an open-flued appliance are there to satisfy Part J combustion-air requirements and should not be counted as existing Part F background ventilation. In practical terms, a combustion air vent is not a free pass to skip proper background ventilation provision.",[],{"id":363,"question":472,"answer":473,"tags":474},"Can noise-attenuating vents be used and what about polluted locations?","Yes, noise-attenuating background ventilators can be used where façade noise is an issue. England’s official Part F FAQ also says ventilation intakes should be located to minimise the intake of external pollutants, including placing trickle ventilators on the less polluted side of the building where possible. So background ventilation still has to work for health and comfort, not just satisfy a size table.",[],{"id":364,"question":476,"answer":477,"tags":478},"What does the IAA \u002F TrustMark-approved process assess?","It assesses the requirement for background ventilation only in an existing dwelling. TrustMark’s retrofit design guidance says the IAA has developed a TrustMark-approved process for assessing whether additional background ventilation is required, and that where the route is used the process in the IAA guidance must be followed. It is a targeted ventilation-evidence tool, not a full substitute for the whole dwelling ventilation strategy.",[],{"id":365,"question":480,"answer":481,"tags":482},"Does background ventilation testing use whole-house and bedroom tests?","Yes, in the IAA method it does. Elmhurst says the method requires whole-house and bedroom tests, and TrustMark’s retrofit design guidance specifically refers to the whole-house threshold plus bedroom tests in bedrooms without ventilators and\u002For with mould or condensation concerns. That is why the service is more than a quick visual check of trickle vents.",[],{"id":366,"question":484,"answer":485,"tags":486},"What results show enough infiltration to avoid background ventilator upgrades?","TrustMark’s retrofit design guidance says that, to demonstrate there is sufficient air infiltration so that background ventilation upgrades are not warranted, the IAA route requires a whole-house result of at least 1.0 ACH @ 4Pa and bedroom results of at least 1.5 ACH @ 4Pa where the bedroom test is required. These are the key benchmark numbers behind the service.",[],{"id":367,"question":488,"answer":489,"tags":490},"Why are these thresholds expressed as ACH at 4Pa?","Because the IAA \u002F TrustMark background ventilation assessment is a low-pressure existing-dwelling ventilation method, not a standard Part L compliance test. TrustMark’s guidance frames the result as air changes per hour at 4Pa, and Approved Document L separately shows that airtightness metrics can be expressed at different pressure differentials, including 50Pa or 4Pa, depending on purpose. The important point is not to mix the 4Pa background-ventilation thresholds up with 50Pa energy-compliance results.",[],{"id":368,"question":492,"answer":493,"tags":494},"Do pre- and post-installation tests both need to be done?","Yes, if you are relying on the TrustMark-recognised IAA route in retrofit. TrustMark’s PAS 2035 retrofit design guidance says the testing must be undertaken both pre and post EEM installation and that the evidence must include the fully completed results from both stages. In commercial terms, that is what turns the service into proof rather than a one-off opinion.",[],{"id":369,"question":496,"answer":497,"tags":498},"Why are bedroom tests sometimes required?","Because the method is trying to avoid missed risk in the rooms where people sleep and where local ventilation provision may be weakest. TrustMark’s design guidance says bedroom tests are required where there are no ventilators and\u002For mould or condensation issues are present. That makes the service more targeted than a blunt whole-house number alone.",[],{"id":370,"question":500,"answer":501,"tags":502},"What happens if the result is below the IAA threshold?","If the result is below the threshold, you should not treat the dwelling as having demonstrated enough air infiltration to waive background ventilator upgrades under the IAA \u002F TrustMark route. At that point, the ventilation strategy normally needs more provision, such as properly sized background ventilators or a different system approach, so the dwelling is no worse than before and still achieves adequate ventilation after the works.",[],{"id":371,"question":504,"answer":505,"tags":506},"Can background ventilation testing show that no extra trickle vents are needed?","Yes, that is one of its main commercial benefits. Elmhurst says background ventilation testing helps avoid unnecessary installation of background ventilators, and TrustMark’s retrofit design guidance gives a model wording for the ventilation strategy stating that successful testing demonstrates there is sufficient air infiltration so that background ventilation upgrades are not warranted. That is exactly why the service is attractive on retrofit jobs where extra vents are unwanted.",[],{"id":372,"question":508,"answer":509,"tags":510},"Why are trickle vents and other ventilation openings closed during the test?","Because the IAA method is checking the dwelling’s worst-case background ventilation condition rather than measuring the performance of opened ventilators. Elmhurst says the property is prepared by closing trickle vents and turning off or closing other vents or ventilation systems, but not sealing them, which gives an indication of the building’s worst-case background ventilation. This is one of the clearest differences from a standard fan-flow or everyday-use check.",[],{"id":373,"question":512,"answer":513,"tags":514},"Can Pulse or blower door equipment be used?","Yes. Elmhurst says the background ventilation test can be carried out using either Pulse or blower door equipment. That is why the service often sits close to airtightness testing in the market: the equipment family overlaps, even though the purpose and the reporting thresholds are different.",[],{"id":374,"question":516,"answer":517,"tags":518},"Is Pulse sometimes easier than a blower door for this job?","Yes, sometimes. Elmhurst says the method lends itself well to Pulse equipment because it allows testing of bedroom door undercuts in bedroom tests, whereas a blower door would need to be installed in the doorway. On occupied retrofit jobs, that practical difference can make the survey easier to stage and less disruptive.",[],{"id":375,"question":520,"answer":521,"tags":522},"Do you need a full Part L air test at the same time?","Not usually. Background ventilation testing and Part L air pressure testing are different services with different objectives and thresholds. That said, where a blower door is used, the visit may overlap technically with airtightness work, and TrustMark’s guidance notes that if you also want to report air permeability results, the dwelling envelope area will need to be measured in addition to the building volume.",[],{"id":376,"question":524,"answer":525,"tags":526},"What needs to be ready before the tester arrives?","The dwelling needs to be accessible, the vents and other ventilation openings need to be in a condition that can be set up correctly for the method, and any other ventilation systems need to be capable of being turned off or closed as required. Elmhurst’s published process notes specifically mention closing trickle vents and closing or turning off other ventilation systems, but not sealing them, before the test starts.",[],{"id":377,"question":528,"answer":529,"tags":530},"Can occupied homes be background ventilation tested?","Yes. The service is aimed at existing properties, and Elmhurst’s own training material describes it as assessing air change rate in existing properties for retrofit and PAS 2035 purposes. In practical terms, that means occupied homes are a normal use case, provided access and setup can be controlled properly for the test.",[],{"id":378,"question":532,"answer":533,"tags":534},"Who should carry out background ventilation testing?","Use a competent tester who understands both airtightness equipment and dwelling ventilation strategy. For the TrustMark-recognised PAS 2035 route, the published guidance expects the process to be followed by a competent person working through the recognised scheme route. On real projects, the right tester is not just someone with a fan, but someone who can explain what the result means for the ventilation upgrade decision.",[],{"id":379,"question":536,"answer":537,"tags":538},"Does the tester need Elmhurst or ATTMA registration for PAS 2035 work?","For the TrustMark-recognised PAS 2035 route, yes, the competency route matters. TrustMark’s retrofit design guidance says testing must be undertaken by a competent person registered with Elmhurst or ATTMA, and TrustMark’s approved-process article also says individuals using the process must be certified by the Elmhurst Air Tightness Scheme. The safest commercial assumption is that background ventilation testing for PAS 2035 should be carried out through the recognised competent-person framework, not informally.",[],{"id":380,"question":540,"answer":541,"tags":542},"How long does background ventilation testing take?","There is no single fixed duration because it depends on the size and complexity of the dwelling and on whether bedroom tests are also required. Elmhurst says quotations vary by building size, complexity and number of tests on the same site, which reflects the real-world pattern: a straightforward house is quicker than a larger dwelling with multiple bedroom checks and awkward access.",[],{"id":381,"question":544,"answer":545,"tags":546},"What affects the cost?","Cost is mainly driven by property size, complexity, the number of tests, and whether the job involves a simple one-off check or a PAS 2035-style pre- and post-installation evidence package. Elmhurst is clear that pricing varies from test to test and depends on building complexity and the number of tests carried out on the same site. On portfolio work, scale can change the economics noticeably.",[],{"id":382,"question":548,"answer":549,"tags":550},"What report or evidence do you get after the test?","For the TrustMark \u002F PAS 2035 route, the expectation is a completed evidence pack rather than a vague note. TrustMark’s retrofit design guidance says copies of the fully completed pre- and post-installation results must be submitted, together with the evidence listed in the guidance documentation, and it also gives the wording that can be used in the ventilation strategy where the thresholds have been met.",[],{"id":383,"question":552,"answer":553,"tags":554},"Does background ventilation testing replace the wider Part F ventilation strategy?","No. It is a tool for the background ventilation part of the problem, not the whole ventilation design. TrustMark’s retrofit design guidance explicitly says the IAA process is for assessing the requirement for background ventilation only, while Approved Document F still requires a complete strategy covering extract ventilation, purge ventilation and, where relevant, mechanical systems. A good result here does not remove the need to get the rest of Part F right.",[],{"id":384,"question":556,"answer":557,"tags":558},"Does it replace extract fan flow rate testing?","No. Mechanical extract and MVHR systems still need the proper airflow measurement and commissioning required by Part F. Background ventilation testing is about passive background provision and existing infiltration; it does not replace the measured fan-flow route for intermittent extract, MEV or MVHR systems. In practice, the two services often complement each other rather than compete.",[],{"id":385,"question":560,"answer":561,"tags":562},"Do System 1 dwellings still need background ventilators?","Yes. Under the current dwelling guidance, natural ventilation with intermittent extract fans — the industry’s old System 1 shorthand — relies on background ventilators plus intermittent extract. The minimum equivalent areas for natural ventilation are set out in Table 1.7 of Approved Document F, so background ventilator sizing is still a core compliance issue on these homes.",[],{"id":386,"question":564,"answer":565,"tags":566},"Do System 3 \u002F MEV dwellings still need background ventilators?","Yes. Continuous mechanical extract ventilation — the old System 3 shorthand — still needs background ventilators in habitable rooms. Approved Document F says these ventilators should not be in wet rooms, should provide at least 4,000 mm² equivalent area for each habitable room, and the total number should be the number of bedrooms plus two. So MEV is not a no-trickle-vent system.",[],{"id":387,"question":568,"answer":569,"tags":570},"Does System 4 \u002F MVHR use background ventilators?","No. Approved Document F says background ventilators should not be installed with mechanical ventilation with heat recovery, because they create unintended air pathways. On existing dwellings moving to MVHR, the guidance also says existing background ventilators should be covered or sealed shut. That is one of the clearest differences between MEV and MVHR from a background-ventilation point of view.",[],{"id":388,"question":572,"answer":573,"tags":574},"What minimum background ventilator sizes apply to new dwellings, and does storey count matter?","Yes, storey count matters for natural ventilation. For current new-dwelling natural-ventilation guidance, habitable rooms and kitchens need 8,000 mm² equivalent area in multi-storey dwellings and 10,000 mm² in single-storey dwellings; bathrooms need 4,000 mm² in both. Approved Document F also says the total number of ventilators in habitable rooms and kitchens should be at least four in one-bedroom dwellings and five in dwellings with more than one bedroom.",[],{"id":389,"question":576,"answer":577,"tags":578},"What minimum background ventilator sizes apply when replacing windows?","For replacement windows in existing dwellings, current English guidance says you can demonstrate the ventilation is no worse than before by incorporating background ventilators of at least 8,000 mm² in habitable rooms, 8,000 mm² in kitchens and 4,000 mm² in bathrooms. If the dwelling will have continuous mechanical extract ventilation, the alternative route is 4,000 mm² in each habitable room, not in wet rooms. If full sizes are not technically feasible, the guidance says the equivalent area should be as close to the minimum as feasible.",[],{"id":390,"question":580,"answer":581,"tags":582},"Can a homeowner sign a disclaimer to avoid installing background ventilators?","No. England’s official Part F FAQ says a homeowner disclaimer is not a suitable way of complying with the Building Regulations, and neither is an indemnity policy. The work still has to comply in full, including the requirement that ventilation is not made less satisfactory by the work. This is particularly relevant on replacement-window jobs where installers are under pressure to “leave the vents out.”",[],{"id":391,"question":584,"answer":585,"tags":586},"Do internal door undercuts matter to background ventilation?","Yes. Approved Document F says internal doors should allow air to flow through the dwelling by providing a minimum free area equivalent to a 10 mm undercut in a standard 760 mm door. That matters because background ventilation is about airflow through the whole dwelling, not just at the vent itself. Elmhurst also notes that Pulse can help assess bedroom-door-undercut issues during bedroom tests.",[],{"id":392,"question":588,"answer":589,"tags":590},"Can background ventilation testing prevent unnecessary trickle vent installation?","Yes, and that is one of the strongest reasons clients book it. Elmhurst says the service helps avoid unnecessary installation of background ventilators, and TrustMark’s retrofit design guidance explicitly recognises the route where successful testing demonstrates enough air infiltration so that background ventilator upgrades are not warranted. On retrofit projects, that can avoid needless disruption, extra cost and resident objections to more vents.",[],{"id":393,"question":592,"answer":593,"tags":594},"What is the best way to use background ventilation testing to get retrofit right first time?","Use it early, and use it as evidence for the ventilation strategy rather than as a late argument after works are finished. The strongest route is to assess the existing dwelling before energy-efficiency measures, use the result to decide whether background ventilator upgrades are genuinely needed, and then repeat the required evidence after installation if you are relying on the TrustMark \u002F IAA route. That keeps the retrofit ventilation strategy evidence-led instead of assumption-led.",[],[],[],[],"boxed","#0a615a","#08cf65","#ebf5f3","#8cf09b","#64748b",18,14,5,21,"widget","FAQs Styled","mb-10","faqs",{"name":168,"componentName":169,"cols":170,"colsMD":171,"customColSpan":8,"parentAlign":172,"bgImage":7,"inlineStyles":7,"bgColor":286,"group":174,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":613,"originalModel":614,"borderWidth":7,"borderColor":7,"borderRadius":7,"sticky":8,"stickyTop":195,"paddingVertical":658,"stickyDisableSmall":8,"blockTemplateId":659,"block_scope":254,"blockLabel":660,"blockDescription":7,"is_block":11,"borderPosition":7,"paddingHorizontal":321,"htmlId":661,"html_id":661,"bgColorOpacity":185,"bgImageVisibility":186,"bgImageSize":187,"bgImagePosition":188,"bgImageRepeat":189,"bgImageAttachment":190,"bgImageOpacity":185,"bgImageVisibilitySM":7,"bgImageVisibilityMD":7,"bgImageVisibilityLG":7,"bgImageSizeSM":7,"bgImageSizeMD":7,"bgImageSizeLG":7,"bgImagePositionSM":7,"bgImagePositionMD":7,"bgImagePositionLG":7,"equalHeightRows":8,"fillParentHeight":8},"ab4c54a2-424d-40d3-8b56-2b9ce1619d72",[615],[616,618,638],{"id":617,"colSpan":180,"colSpanSM":181,"colSpanMD":182,"colSpanLG":183,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7,"bgColorOpacity":185,"bgImage":7,"bgImageVisibility":186,"bgImageSize":187,"bgImagePosition":188,"bgImageRepeat":189,"bgImageAttachment":190,"bgImageOpacity":185,"bgImageVisibilitySM":7,"bgImageVisibilityMD":7,"bgImageVisibilityLG":7,"bgImageSizeSM":7,"bgImageSizeMD":7,"bgImageSizeLG":7,"bgImagePositionSM":7,"bgImagePositionMD":7,"bgImagePositionLG":7},"38e00417-c231-4100-a898-160be6ccfcf0",{"name":192,"componentName":169,"nested":11,"cols":170,"colsMD":171,"customColSpan":8,"parentAlign":172,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":193,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":619,"borderWidth":7,"borderPosition":7,"borderColor":7,"borderRadius":7,"sticky":8,"stickyTop":195,"stickyDisableSmall":8,"originalModel":620,"containerWidth":210,"paddingBottom":635,"blockTemplateId":604,"blockLabel":636,"blockDescription":7,"block_scope":637,"is_block":11,"bgColorOpacity":185,"bgImageVisibility":186,"bgImageSize":187,"bgImagePosition":188,"bgImageRepeat":189,"bgImageAttachment":190,"bgImageOpacity":185,"bgImageVisibilitySM":7,"bgImageVisibilityMD":7,"bgImageVisibilityLG":7,"bgImageSizeSM":7,"bgImageSizeMD":7,"bgImageSizeLG":7,"bgImagePositionSM":7,"bgImagePositionMD":7,"bgImagePositionLG":7,"equalHeightRows":8,"fillParentHeight":8},"e5ab58a1-eda5-47c9-8ad6-0012799cb125",[621,628],[622,624],{"id":623,"colSpan":180,"colSpanSM":217,"colSpanMD":218,"colSpanLG":219,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderPosition":7,"borderColor":7,"borderRadius":7,"classes":7,"bgColorOpacity":185,"bgImage":7,"bgImageVisibility":186,"bgImageSize":187,"bgImagePosition":188,"bgImageRepeat":189,"bgImageAttachment":190,"bgImageOpacity":185,"bgImageVisibilitySM":7,"bgImageVisibilityMD":7,"bgImageVisibilityLG":7,"bgImageSizeSM":7,"bgImageSizeMD":7,"bgImageSizeLG":7,"bgImagePositionSM":7,"bgImagePositionMD":7,"bgImagePositionLG":7},"78a797e6-3478-4935-a151-81562deb50fd",{"name":201,"componentName":202,"group":203,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":625,"originalModel":626},"01365215-9999-438e-901d-c595459e521f",{"proseEnabled":8,"content":627,"lineHeightClass":207,"trackingClass":208,"spacingClass":209,"margin":7,"marginSM":7,"marginMD":7,"marginLG":7,"marginTop":7,"marginTopSM":7,"marginTopMD":7,"marginTopLG":7,"marginRight":7,"marginRightSM":7,"marginRightMD":7,"marginRightLG":7,"marginBottom":7,"marginBottomSM":7,"marginBottomMD":7,"marginBottomLG":7,"marginLeft":7,"marginLeftSM":7,"marginLeftMD":7,"marginLeftLG":7,"padding":7,"paddingSM":7,"paddingMD":7,"paddingLG":7},"\u003Ch2 class=\"text-2xl md:text-3xl text-theme-dark-green font-medium mb-4\">Videos for background ventilation testing\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Explore our videos for quick, engaging insights on building compliance. From step-by-step guides to expert advice, our video library simplifies complex topics, making it easier for you to take action and stay informed. Perfect for when you need clarity in minutes!\u003C\u002Fstrong>\u003C\u002Fp>",[629,631],{"id":630,"colSpan":180,"colSpanSM":217,"colSpanMD":218,"colSpanLG":219,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderPosition":7,"borderColor":7,"borderRadius":7,"classes":7,"bgColorOpacity":185,"bgImage":7,"bgImageVisibility":186,"bgImageSize":187,"bgImagePosition":188,"bgImageRepeat":189,"bgImageAttachment":190,"bgImageOpacity":185,"bgImageVisibilitySM":7,"bgImageVisibilityMD":7,"bgImageVisibilityLG":7,"bgImageSizeSM":7,"bgImageSizeMD":7,"bgImageSizeLG":7,"bgImagePositionSM":7,"bgImagePositionMD":7,"bgImagePositionLG":7},"9ae6ccd4-077d-4c48-a62a-5d38e06f29f2",{"name":201,"componentName":202,"group":203,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":632,"originalModel":633},"5c8444c7-b536-45a3-a2ae-d9d84a57df3a",{"proseEnabled":11,"content":634,"lineHeightClass":207,"trackingClass":208,"spacingClass":209,"margin":7,"marginSM":7,"marginMD":7,"marginLG":7,"marginTop":7,"marginTopSM":7,"marginTopMD":7,"marginTopLG":7,"marginRight":7,"marginRightSM":7,"marginRightMD":7,"marginRightLG":7,"marginBottom":7,"marginBottomSM":7,"marginBottomMD":7,"marginBottomLG":7,"marginLeft":7,"marginLeftSM":7,"marginLeftMD":7,"marginLeftLG":7,"padding":7,"paddingSM":7,"paddingMD":7,"paddingLG":7},"\u003Cdiv 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334.5z\">\u003C\u002Fpath>\u003C\u002Fsvg>\u003Ch4 class=\"text-lg \" style=\"color:#08CF65\">Case studies\u003C\u002Fh4>\n\u003Cp class=\"mt-2 theme-dark-green-lighter text-theme-dark-green tracking-wide subtle-bold-spaced\">Learn from real-world examples that highlight challenges, solutions, and 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class=\"et_pb_column et_pb_column_4_4 et_pb_column_7  et_pb_css_mix_blend_mode_passthrough et-last-child\">\n\u003Cdiv class=\"et_pb_module et_pb_text et_pb_text_2  et_pb_text_align_left et_pb_bg_layout_light\">\n\u003Ch2 class=\"et_pb_text_inner\">Choose a category below\u003C\u002Fh2>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>",{"name":692,"componentName":693,"group":203,"id":889,"originalModel":890},"f888707a-b2c9-4695-8a60-3f76536a337b",{"pageTypeId":161,"tags":891,"orderMode":700,"orderBy":701,"orderDirection":702,"manualPageIds":892,"selectedPageIds":893,"excludedPageIds":894,"autoPageOrderIds":895,"maxItems":7,"itemClass":896,"template":897,"columns":898},[],[],[],[],[],"relative","\u003Cdiv style=\"display:flex; align-items:center;\">\n    \u003Ca href=\"{{full_url}}\" class=\"link-lift\" style=\"display:flex; align-items:center; font-size:18px; text-decoration:none; transition: transform 0.15s ease;\" style=\"color:#0284c7\">\n        \u003Cimg src=\"{{icon}}\" style=\"height:40px; \" alt=\"{{ title }}\" class=\"object-contain\">\n        \u003Cspan style=\"margin-left:10px\">{{ title }}\u003C\u002Fspan>\n    \u003C\u002Fa>\n\u003C\u002Fdiv>",{"lg":161,"md":319,"sm":282},"2026-02-05T09:58:50.000000Z","2026-06-16T10:20:37.000000Z","Knowledge Hub Welcome to the knowledge hub—your all-in-one resource for mastering building compliance. We’ve designed this space to educate and empower you in five key ways. Whether you prefer to watch, read, or apply hands-on tools, the knowledge hub has everything you need to navigate compliance with confidence.. Videos Watch concise, expert-led tutorials and guides to quickly grasp complex topics. FAQs Get clear answers to common questions, saving you time and uncertainty. Checklists Use practical, downloadable tools to simplify your compliance journey. Blogs Stay informed with actionable insights, tips, and the latest industry updates. Case studies Learn from real-world examples that highlight challenges, solutions, and successes. Choose a category below {{ title }}","\u003Ch1 class=\"text-center text-5xl md:text-6xl leading-[1.2em]  text-theme-dark-green mb-4\" style=\"text-align: left;\">Knowledge Hub\u003C\u002Fh1>\n\u003Cdiv class=\"et_pb_module et_pb_text et_pb_text_1  et_pb_text_align_left et_pb_bg_layout_light\">\n\u003Cdiv class=\"et_pb_text_inner lead\">Welcome to the knowledge hub—your all-in-one resource for mastering building compliance. We’ve designed this space to educate and empower you in five key ways. Whether you prefer to watch, read, or apply hands-on tools, the knowledge hub has everything you need to navigate compliance with confidence..\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"0 0 640 640\" style=\"max-height: 50px;\" fill=\"#04454d\">\u003Cpath d=\"M581.7 188.1C575.5 164.4 556.9 145.8 533.4 139.5C490.9 128 320.1 128 320.1 128C320.1 128 149.3 128 106.7 139.5C83.2 145.8 64.7 164.4 58.4 188.1C47 231 47 320.4 47 320.4C47 320.4 47 409.8 58.4 452.7C64.7 476.3 83.2 494.2 106.7 500.5C149.3 512 320.1 512 320.1 512C320.1 512 490.9 512 533.5 500.5C557 494.2 575.5 476.3 581.8 452.7C593.2 409.8 593.2 320.4 593.2 320.4C593.2 320.4 593.2 231 581.8 188.1zM264.2 401.6L264.2 239.2L406.9 320.4L264.2 401.6z\"\u002F>\u003C\u002Fsvg>\n\u003Ch4 class=\"text-lg \"style=\"color:#08CF65\">Videos\u003C\u002Fh4>\n\u003Cp class=\"mt-2 theme-dark-green-lighter text-theme-dark-green tracking-wide subtle-bold-spaced\" >Watch concise, expert-led tutorials and guides to quickly grasp complex topics.\u003C\u002Fp>\n\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"0 0 640 640\" style=\"max-height: 50px;\" fill=\"#04454d\">\n\u003Cpath d=\"M416 208C416 305.2 330 384 224 384C197.3 384 171.9 379 148.8 370L67.2 413.2C57.9 418.1 46.5 416.4 39 409C31.5 401.6 29.8 390.1 34.8 380.8L70.4 313.6C46.3 284.2 32 247.6 32 208C32 110.8 118 32 224 32C330 32 416 110.8 416 208zM416 576C321.9 576 243.6 513.9 227.2 432C347.2 430.5 451.5 345.1 463 229.3C546.3 248.5 608 317.6 608 400C608 439.6 593.7 476.2 569.6 505.6L605.2 572.8C610.1 582.1 608.4 593.5 601 601C593.6 608.5 582.1 610.2 572.8 605.2L491.2 562C468.1 571 442.7 576 416 576z\"\u002F>\u003C\u002Fsvg>\n\u003Ch4 class=\"text-lg \"style=\"color:#08CF65\">FAQs\u003C\u002Fh4>\n\u003Cp class=\"mt-2 theme-dark-green-lighter text-theme-dark-green tracking-wide subtle-bold-spaced\" >Get clear answers to common questions, saving you time and uncertainty.\u003C\u002Fp>\n\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"0 0 640 640\" style=\"max-height: 50px;\" fill=\"#04454d\">\u003Cpath d=\"M197.8 100.3C208.7 107.9 211.3 122.9 203.7 133.7L147.7 213.7C143.6 219.5 137.2 223.2 130.1 223.8C123 224.4 116 222 111 217L71 177C61.7 167.6 61.7 152.4 71 143C80.3 133.6 95.6 133.7 105 143L124.8 162.8L164.4 106.2C172 95.3 187 92.7 197.8 100.3zM197.8 260.3C208.7 267.9 211.3 282.9 203.7 293.7L147.7 373.7C143.6 379.5 137.2 383.2 130.1 383.8C123 384.4 116 382 111 377L71 337C61.6 327.6 61.6 312.4 71 303.1C80.4 293.8 95.6 293.7 104.9 303.1L124.7 322.9L164.3 266.3C171.9 255.4 186.9 252.8 197.7 260.4zM288 160C288 142.3 302.3 128 320 128L544 128C561.7 128 576 142.3 576 160C576 177.7 561.7 192 544 192L320 192C302.3 192 288 177.7 288 160zM288 320C288 302.3 302.3 288 320 288L544 288C561.7 288 576 302.3 576 320C576 337.7 561.7 352 544 352L320 352C302.3 352 288 337.7 288 320zM224 480C224 462.3 238.3 448 256 448L544 448C561.7 448 576 462.3 576 480C576 497.7 561.7 512 544 512L256 512C238.3 512 224 497.7 224 480zM128 440C150.1 440 168 457.9 168 480C168 502.1 150.1 520 128 520C105.9 520 88 502.1 88 480C88 457.9 105.9 440 128 440z\" style=\"align:left\" \u002F>\u003C\u002Fsvg>\n\u003Ch4 class=\"text-lg \"style=\"color:#08CF65\">Checklists\u003C\u002Fh4>\n\u003Cp class=\"mt-2 theme-dark-green-lighter text-theme-dark-green tracking-wide subtle-bold-spaced\" >Use practical, downloadable tools to simplify your compliance journey.\u003C\u002Fp>\n\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"0 0 640 640\" style=\"max-height: 50px;\" fill=\"#04454d\" >\u003C!--!Font Awesome Free v7.2.0 by @fontawesome - https:\u002F\u002Ffontawesome.com License - https:\u002F\u002Ffontawesome.com\u002Flicense\u002Ffree Copyright 2026 Fonticons, Inc.-->\u003Cpath d=\"M320 205.3L320 514.6L320.5 514.4C375.1 491.7 433.7 480 492.8 480L512 480L512 160L492.8 160C450.6 160 408.7 168.4 369.7 184.6C352.9 191.6 336.3 198.5 320 205.3zM294.9 125.5L320 136L345.1 125.5C391.9 106 442.1 96 492.8 96L528 96C554.5 96 576 117.5 576 144L576 496C576 522.5 554.5 544 528 544L492.8 544C442.1 544 391.9 554 345.1 573.5L332.3 578.8C324.4 582.1 315.6 582.1 307.7 578.8L294.9 573.5C248.1 554 197.9 544 147.2 544L112 544C85.5 544 64 522.5 64 496L64 144C64 117.5 85.5 96 112 96L147.2 96C197.9 96 248.1 106 294.9 125.5z\"\u002F>\u003C\u002Fsvg>\u003Ch4 class=\"text-lg \"style=\"color:#08CF65\">Blogs\u003C\u002Fh4>\n\u003Cp class=\"mt-2 theme-dark-green-lighter text-theme-dark-green tracking-wide subtle-bold-spaced\" >Stay informed with actionable insights, tips, and the latest industry updates.\u003C\u002Fp>\n\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" style=\"max-height: 50px;\" fill=\"#04454d\" viewBox=\"0 0 640 640\">\u003C!--!Font Awesome Free v7.2.0 by @fontawesome - https:\u002F\u002Ffontawesome.com License - https:\u002F\u002Ffontawesome.com\u002Flicense\u002Ffree Copyright 2026 Fonticons, Inc.-->\u003Cpath d=\"M320.3 192L235.7 51.1C229.2 40.3 215.6 36.4 204.4 42L117.8 85.3C105.9 91.2 101.1 105.6 107 117.5L176.6 256.6C146.5 290.5 128.3 335.1 128.3 384C128.3 490 214.3 576 320.3 576C426.3 576 512.3 490 512.3 384C512.3 335.1 494 290.5 464 256.6L533.6 117.5C539.5 105.6 534.7 91.2 522.9 85.3L436.2 41.9C425 36.3 411.3 40.3 404.9 51L320.3 192zM351.1 334.5C352.5 337.3 355.1 339.2 358.1 339.6L408.2 346.9C415.9 348 418.9 357.4 413.4 362.9L377.1 398.3C374.9 400.5 373.9 403.5 374.4 406.6L383 456.5C384.3 464.1 376.3 470 369.4 466.4L324.6 442.8C321.9 441.4 318.6 441.4 315.9 442.8L271.1 466.4C264.2 470 256.2 464.2 257.5 456.5L266.1 406.6C266.6 403.6 265.6 400.5 263.4 398.3L227.1 362.9C221.5 357.5 224.6 348.1 232.3 346.9L282.4 339.6C285.4 339.2 288.1 337.2 289.4 334.5L311.8 289.1C315.2 282.1 325.1 282.1 328.6 289.1L351 334.5z\">\u003C\u002Fpath>\u003C\u002Fsvg>\u003Ch4 class=\"text-lg \" style=\"color:#08CF65\">Case studies\u003C\u002Fh4>\n\u003Cp class=\"mt-2 theme-dark-green-lighter text-theme-dark-green tracking-wide subtle-bold-spaced\">Learn from real-world examples that highlight challenges, solutions, and successes.\u003C\u002Fp>\n\u003Cdiv class=\"et_pb_column et_pb_column_4_4 et_pb_column_7  et_pb_css_mix_blend_mode_passthrough et-last-child\">\n\u003Cdiv class=\"et_pb_module et_pb_text et_pb_text_2  et_pb_text_align_left et_pb_bg_layout_light\">\n\u003Ch2 class=\"et_pb_text_inner\">Choose a category below\u003C\u002Fh2>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003Cdiv style=\"display:flex; align-items:center;\">\n    \u003Ca href=\"{{full_url}}\" class=\"link-lift\" style=\"display:flex; align-items:center; font-size:18px; text-decoration:none; transition: transform 0.15s ease;\" style=\"color:#0284c7\">\n        \u003Cimg src=\"{{icon}}\" style=\"height:40px; \" alt=\"{{ title }}\" class=\"object-contain\">\n        \u003Cspan style=\"margin-left:10px\">{{ title }}\u003C\u002Fspan>\n    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