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Ventilation Flow Rate Testing 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\" aria-hidden=\"true\">\u003C\u002Fspan>\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003C\u002Fa>\n\u003C\u002Fsection>",20,"Service Checklist HTML","gap-6","my-10","flex","flex-row","flex-wrap",2,"downloads","px-5",{"name":16,"componentName":17,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":22,"inlineStyles":22,"bgColor":138,"group":24,"margin":22,"padding":22,"classes":22,"colSpan":22,"id":175,"originalModel":176,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"sticky":20,"stickyTop":45,"stickyDisableSmall":20,"htmlId":463,"html_id":463,"paddingHorizontal":173,"bgColorOpacity":35,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22,"equalHeightRows":20,"fillParentHeight":20},"d311a79e-0620-4495-ba22-0cbc7486e030",[177],[178,180],{"id":179,"colSpan":30,"colSpanSM":31,"colSpanMD":32,"colSpanLG":33,"customColSpan":20,"bgColor":22,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"classes":22,"bgColorOpacity":35,"bgImage":22,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22},"831967ca-64f7-4d00-8456-e926ab43aa28",{"name":42,"componentName":17,"nested":13,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":22,"inlineStyles":22,"bgColor":22,"group":43,"margin":22,"padding":22,"classes":22,"colSpan":22,"id":181,"originalModel":182,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"sticky":20,"stickyTop":45,"stickyDisableSmall":20,"containerWidth":60,"marginBottom":462,"bgColorOpacity":35,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22,"equalHeightRows":20,"fillParentHeight":20},"e60f36ea-40a4-46c9-bdd7-25f0c6c4b762",[183],[184,186,190],{"id":185,"colSpan":30,"colSpanSM":31,"colSpanMD":32,"colSpanLG":33,"customColSpan":20,"bgColor":22,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"classes":22,"bgColorOpacity":35,"bgImage":22,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22},"c43a90d1-1692-41e5-af9d-2e04c3c12e22",{"name":51,"componentName":52,"group":53,"margin":22,"padding":22,"classes":22,"bgImage":22,"id":187,"originalModel":188},"93536152-0a30-4ae8-812b-58b8b0e7aec8",{"proseEnabled":13,"content":189,"lineHeightClass":57,"trackingClass":58,"spacingClass":59,"margin":22,"marginSM":22,"marginMD":22,"marginLG":22,"marginTop":22,"marginTopSM":22,"marginTopMD":22,"marginTopLG":22,"marginRight":22,"marginRightSM":22,"marginRightMD":22,"marginRightLG":22,"marginBottom":22,"marginBottomSM":22,"marginBottomMD":22,"marginBottomLG":22,"marginLeft":22,"marginLeftSM":22,"marginLeftMD":22,"marginLeftLG":22,"padding":22,"paddingSM":22,"paddingMD":22,"paddingLG":22},"\u003Cdiv 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 questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>",{"name":191,"componentName":192,"group":53,"id":193,"componentConfig":194,"blockTemplateId":459,"block_scope":460,"blockLabel":461,"blockDescription":22,"is_block":13},"FAQs","Faqs","b1bbb570-32ea-473c-b012-1b2c303383b7",{"selectedFaqIds":195,"selectedFaqs":246,"tagFilters":447,"excludedFaqIds":448,"autoFaqOrderIds":449,"allowMultiple":13,"openFirst":13,"variant":450,"titleColor":451,"activeTitleColor":452,"bodyColor":451,"boxBackgroundColor":453,"boxBorderColor":454,"iconColor":455,"itemSpacing":164,"titleFontSize":456,"bodyFontSize":457,"maxVisibleItems":458},[196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245],360,1133,1134,1135,1136,1137,1138,1139,1140,1141,1142,1143,1144,1145,1146,1147,1148,1149,1150,1151,1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162,1163,1164,1165,1166,1167,1168,1169,1170,1171,1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,[247,251,255,259,263,267,271,275,279,283,287,291,295,299,303,307,311,315,319,323,327,331,335,339,343,347,351,355,359,363,367,371,375,379,383,387,391,395,399,403,407,411,415,419,423,427,431,435,439,443],{"id":196,"question":248,"answer":249,"tags":250},"What is ventilation flow rate testing?","Ventilation flow rate testing is the on-site measurement of how much air a mechanical ventilation system is actually moving at each terminal or fan. In practical terms, it checks whether the installed system is delivering the airflow rates required by Part F, rather than just relying on what the product label or design intent said. On most residential jobs, it is the test people mean when they say a Part F ventilation test or extractor fan flow test.",[],{"id":197,"question":252,"answer":253,"tags":254},"Is ventilation flow rate testing the same as Part F ventilation testing?","Usually, yes. In day-to-day UK site language, ventilation flow rate testing, Part F testing, extractor fan testing and ventilation commissioning checks are often used interchangeably. Strictly speaking, flow rate testing is the measurement part, while full Part F commissioning also covers inspection, controls and handover information. So the airflow readings are central, but they are not the whole compliance picture on their own.",[],{"id":198,"question":256,"answer":257,"tags":258},"Why is ventilation flow rate testing required under Part F?","It is required because Part F is about proving adequate ventilation in the building that was actually installed, not just the one shown on drawings. Approved Document F says mechanical ventilation systems must be commissioned and, for the relevant work, measured so the results show the system is achieving the required flow rates. On site, that makes ventilation flow rate testing a sign-off issue, not a paperwork extra.",[],{"id":199,"question":260,"answer":261,"tags":262},"Which ventilation systems does this service cover?","In practical residential terms, this service mainly covers System 1, System 3 and System 4. Those are the fan-based dwelling systems most clients mean when they ask for ventilation flow rate testing: intermittent extract with background vents, continuous mechanical extract, and MVHR. The current Approved Document guidance is written in functional rather than numbered language, but those industry labels are still widely used and still useful for booking and scoping the right test.",[],{"id":200,"question":264,"answer":265,"tags":266},"Why is System 2 usually left out of ventilation flow rate testing pages now?","Because current common guidance in Approved Document F no longer includes passive stack ventilation as one of the standard dwelling routes it sets out in detail. Government’s 2021 response explains that passive stack can still be used if compliance is shown, but it was removed from the common Approved Document guidance because it is not common enough for inclusion there. That is why most current residential flow-rate pages focus on Systems 1, 3 and 4.",[],{"id":201,"question":268,"answer":269,"tags":270},"What is System 1 ventilation?","System 1 is the industry shorthand for background ventilators plus intermittent extract fans. In current Approved Document F guidance, this appears as natural ventilation with background ventilators and intermittent extract fans. In practice, that means trickle ventilators supplying background air to the dwelling and separate fan extract from wet rooms such as kitchens, bathrooms and WCs. It is the simplest and most common fan-based setup on many straightforward new homes.",[],{"id":202,"question":272,"answer":273,"tags":274},"What is System 3 ventilation?","System 3 is continuous mechanical extract ventilation, often shortened to MEV or dMEV depending on the setup. Approved Document F describes it as a continuous extract system that may be centralised, room-by-room, or a combination of both. In practice, it continuously removes stale air from wet rooms, while replacement air usually comes through background ventilators in habitable rooms.",[],{"id":203,"question":276,"answer":277,"tags":278},"What is System 4 ventilation?","System 4 is continuous mechanical supply and extract ventilation with heat recovery, commonly called MVHR. Approved Document F describes this as mechanical supply ventilation to habitable rooms and continuous extract from wet rooms, with guidance that the moist air should not be recirculated back into habitable spaces. In practical terms, it is the whole-house supply-and-extract route used on tighter, more energy-efficient homes.",[],{"id":204,"question":280,"answer":281,"tags":282},"Does System 1 need ventilation flow rate testing?","Yes. System 1 still includes mechanical extract fans, so the airflow from those fans has to be checked. Approved Document F says airflow testing applies to intermittent extract fans as well as continuous systems, and that the readings must be recorded on the commissioning sheet. The fact that the whole system is “natural plus intermittent” does not take the fan testing out of scope.",[],{"id":205,"question":284,"answer":285,"tags":286},"Does System 3 need ventilation flow rate testing?","Yes. System 3 is a continuous mechanical system, so airflow measurement and balancing are central to commissioning it properly. Approved Document F says continuous mechanical extract systems should be balanced to achieve design airflow rates at each room terminal, and the measured flows should be recorded. On a live site, System 3 is not something you just power up and assume is fine.",[],{"id":206,"question":288,"answer":289,"tags":290},"Does System 4 or MVHR need ventilation flow rate testing?","Yes, absolutely. MVHR is a whole-house mechanical system, so both the extract and supply sides need proper airflow measurement and commissioning. Approved Document F treats continuous supply fans and terminals, and MVHR-type systems, as part of the flow-testing regime. In practice, System 4 is the route where poor commissioning is most likely to waste the benefit of a good design.",[],{"id":207,"question":292,"answer":293,"tags":294},"When should ventilation flow rate testing be carried out?","Carry it out when the ventilation system is installed, powered, and genuinely ready to commission, not while the plot is still half-finished. The core Part F logic is that the system must be commissioned and measured in its installed condition, so terminals, ductwork, controls and background ventilators all need to be in place and usable. On real jobs, calling the tester too early is one of the easiest ways to create a wasted visit.",[],{"id":208,"question":296,"answer":297,"tags":298},"What needs to be ready before the tester arrives?","The fans or central unit need power, the terminals need to be fitted, the ductwork needs to be complete, and the dwelling needs to be accessible enough to test properly. Approved Document F also expects the system to be inspected visually, so obvious defects, damaged ducting and missing controls are all problems before the airflow hood even comes out. Good readiness is what protects first-time pass.",[],{"id":209,"question":300,"answer":301,"tags":302},"Do internal and external doors and windows need to be closed during the test?","Yes. The approved procedure says all internal and external doors and windows should be closed when the airflow measurements are taken. That matters because open doors or windows can change the pressure relationships in the dwelling and distort the readings. On site, this is one of the simplest setup rules, but it is also one of the easiest for trades to get wrong if the test is not controlled properly.",[],{"id":210,"question":304,"answer":305,"tags":306},"Do background ventilators need to be open during the test?","Yes. The approved procedure says all intended background ventilators or other air transfer devices should be open during the flow-rate measurement. That is especially important on System 1 and System 3 jobs, where the fans are meant to work with purpose-provided air inlets. Closing trickle vents to force a better reading is not a real pass; it just produces the wrong test condition.",[],{"id":211,"question":308,"answer":309,"tags":310},"Do internal door undercuts matter to ventilation flow rate testing?","Yes. Internal air transfer matters because the system still has to move air through the dwelling, not just at the fan face. Approved Document F says internal doors should allow air to flow through the home by providing a free area equivalent to a 10mm undercut in a 760mm door. If the transfer path is blocked, the measured room performance and the real in-use performance can both suffer.",[],{"id":212,"question":312,"answer":313,"tags":314},"What equipment is used for ventilation flow rate testing?","The standard tool is a calibrated airflow measurement device with a proprietary hood fitted over the terminal or fan. Approved Document F is explicit on this point, and for larger or more complex domestic systems the hood-based method is the normal compliance route. In practical terms, proper flow-rate testing is a measured commissioning exercise, not just putting a hand near the grille and guessing.",[],{"id":213,"question":316,"answer":317,"tags":318},"Does the airflow test equipment need calibration?","Yes. Approved Document F says the airflow device should be calibrated within the last 12 months at a calibration centre accredited by UKAS, and Wales states the same basic expectation. That matters because these are compliance measurements, not rough site checks. If the kit is not properly calibrated, the result is much harder to rely on when Building Control wants evidence.",[],{"id":214,"question":320,"answer":321,"tags":322},"Can a vane anemometer be used for ventilation flow rate testing?","For intermittent extract fans, yes in some cases, but not as the general answer for whole-system commissioning. The incoming 2026 England guidance says a vane anemometer may be used as an alternative for intermittent extract fans, while powered flow-hood measurement remains the preferred route for continuous systems. In practice, whole-house System 3 and System 4 commissioning still points you toward the proper hood-based setup.",[],{"id":215,"question":324,"answer":325,"tags":326},"Do you test at each terminal or just at the fan unit?","You test at each relevant room terminal or fan point, not just once at the main unit and hope the branch layout is correct. Approved Document F says the airflow should be measured at each room terminal and recorded on the commissioning sheet. That is particularly important on System 3 and System 4 because the whole point is to prove the rooms are getting the airflow they were designed to get.",[],{"id":216,"question":328,"answer":329,"tags":330},"Are cooker hoods included in ventilation flow rate testing?","Yes. Approved Document F says airflow testing includes cooker hoods as well as intermittent extract fans and continuous systems. That catches some site teams out because cooker hoods often get treated as a kitchen fitting rather than a Part F item. For compliance purposes, if it is providing extract ventilation, it is part of the testing conversation.",[],{"id":217,"question":332,"answer":333,"tags":334},"Can a recirculating cooker hood count as compliant kitchen ventilation on its own?","No. Approved Document F is clear that a recirculating cooker hood on its own does not provide a means of ventilation that complies with Part F. That is why the kitchen extract requirement changes depending on whether the hood actually extracts to outside. On site, this is a common misunderstanding that can create a late compliance problem in otherwise tidy kitchens.",[],{"id":218,"question":336,"answer":337,"tags":338},"What are the minimum System 1 extract rates?","For System 1 intermittent extract, the key minimum rates are 30 l\u002Fs for a kitchen where the cooker hood extracts outside, 60 l\u002Fs where it does not, 30 l\u002Fs for a utility room, 15 l\u002Fs for a bathroom and 6 l\u002Fs for sanitary accommodation. These are the baseline Part F numbers the fan test is checking against for intermittent operation.",[],{"id":219,"question":340,"answer":341,"tags":342},"Why is the kitchen extract rate 30 l\u002Fs on some homes and 60 l\u002Fs on others?","Because the required rate depends on whether there is a cooker hood extracting directly to outside. Approved Document F sets 30 l\u002Fs where the hood extracts outside and 60 l\u002Fs where there is no external extract or the hood does not extract outside. In practical terms, the building has to make up for the missing direct-to-outside cooker extract somehow, and that is why the fan target doubles.",[],{"id":220,"question":344,"answer":345,"tags":346},"What high-rate extract figures apply to System 3 and System 4?","For the continuous systems, the minimum high-rate extract figures are 13 l\u002Fs for a kitchen, 8 l\u002Fs for a utility room, 8 l\u002Fs for a bathroom and 6 l\u002Fs for sanitary accommodation. These are the same high-rate wet-room benchmarks used for both continuous mechanical extract ventilation and MVHR-type systems. They are the key room-by-room boost numbers the commissioning process checks.",[],{"id":221,"question":348,"answer":349,"tags":350},"What whole-dwelling ventilation rates apply to System 3 and System 4?","For both System 3 and System 4, the whole-dwelling minimum is the larger of 0.3 l\u002Fs per m² of internal floor area and the bedroom-based rate in Table 1.3. The bedroom values are 19, 25, 31, 37 and 43 l\u002Fs for one to five bedrooms, with 6 l\u002Fs added for each extra bedroom beyond five. That is the whole-house benchmark before you even get into terminal-by-terminal balancing.",[],{"id":222,"question":352,"answer":353,"tags":354},"How are whole-dwelling ventilation rates calculated in practice?","In practice, you compare two figures and use the higher one. Approved Document F says the dwelling has to achieve at least 0.3 l\u002Fs per m² of total internal floor area, and also at least the minimum rate set by bedroom count. That means a larger but low-bedroom property can still need a higher airflow because of its floor area, not just because of its room count.",[],{"id":223,"question":356,"answer":357,"tags":358},"Does System 3 need background ventilators?","Yes. Approved Document F says that where continuous mechanical extract ventilation is used, background ventilators should not be in wet rooms, should provide at least 4,000 mm² equivalent area for each habitable room, and should be provided in a total number equal to the number of bedrooms plus two. In simple terms, System 3 still needs designed supply air paths.",[],{"id":224,"question":360,"answer":361,"tags":362},"What background ventilator sizes apply to System 1?","For natural ventilation with intermittent extract, Approved Document F Table 1.7 sets typical minimum equivalent areas of 8,000 mm² for habitable rooms and kitchens in multi-storey dwellings, 10,000 mm² in single-storey dwellings, and 4,000 mm² for bathrooms where relevant. The dwelling also needs a minimum overall number of ventilators, not just one oversized vent somewhere convenient.",[],{"id":225,"question":364,"answer":365,"tags":366},"Should fans and background ventilators be at least 0.5m apart?","Yes. Approved Document F says that if fans and background ventilators are fitted in the same room, they should be at least 500mm apart. That spacing helps avoid short-circuiting the air path and undermining the way the room is supposed to ventilate. On real jobs, it is a small coordination detail that is easy to miss during second fix.",[],{"id":226,"question":368,"answer":369,"tags":370},"Should background ventilators be installed in wet rooms on System 3?","No. Approved Document F says that where continuous mechanical extract ventilation is used, background ventilators should not be in wet rooms. The supply air is supposed to come through habitable spaces and transfer across the dwelling before being extracted from kitchens, bathrooms and similar rooms. Putting the vent in the wet room defeats that intended airflow path.",[],{"id":227,"question":372,"answer":373,"tags":374},"Should MVHR or System 4 have 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. System 4 is designed to provide the supply and extract air mechanically, so adding trickle vents undermines the controlled whole-house strategy. On site, this is one of the cleanest practical differences between System 3 and System 4.",[],{"id":228,"question":376,"answer":377,"tags":378},"Does System 4 testing include supply terminals as well as extract terminals?","Yes. MVHR is not just an extract test. Approved Document F requires testing of continuous supply fans and terminals as well as extract points, and the commissioning sheet includes separate sections for extract and supply measurements for MVHR. If only the extract side is being measured, the commissioning picture is incomplete.",[],{"id":229,"question":380,"answer":381,"tags":382},"Do System 3 and System 4 need balancing?","Yes. Approved Document F says continuous mechanical ventilation systems, such as MEV and MVHR, should be balanced to achieve design airflow rates at each room terminal. That is why whole-house commissioning takes longer than a simple fan spot-check. On a live site, balancing is where you turn a nominal system into one that actually performs room by room.",[],{"id":230,"question":384,"answer":385,"tags":386},"Do System 1 fans need manual override and run-on time?","Yes, where the guidance calls for it. Approved Document F says automatic controls for intermittent extract should have a manual override, and where a room has no openable window the fan should continue to operate for at least 15 minutes after the room is vacated. The commissioning checks also include confirming that run-on timers are set appropriately.",[],{"id":231,"question":388,"answer":389,"tags":390},"Is System 1 suitable for airtight dwellings?","Not generally. The current dwelling guidance says natural ventilation with background ventilators and intermittent extract fans is suitable only for less airtight dwellings. Continuous mechanical extract ventilation and MVHR are the common routes for all dwellings, while System 1 is specifically limited by airtightness assumptions. That is why flow-rate testing and airtightness strategy should never be treated as separate worlds.",[],{"id":232,"question":392,"answer":393,"tags":394},"What counts as a highly airtight dwelling under Part F?","Under the current Approved Document F definitions, a highly airtight dwelling is one with either a design air permeability below 5 m³\u002F(h·m²) at 50Pa or an as-built air permeability below 3 m³\u002F(h·m²) at 50Pa. That threshold matters because it affects whether the natural-ventilation guidance is appropriate or whether a more controlled mechanical route should be used instead.",[],{"id":233,"question":396,"answer":397,"tags":398},"What if the finished air test makes a natural-ventilation design too airtight?","Approved Document F says that if a dwelling designed for natural ventilation turns out to be highly airtight when tested, expert advice should be sought or a continuous mechanical extract ventilation system should be installed following the relevant guidance. In practice, that is exactly why Part F and Part L coordination matters. The air test can force a ventilation rethink if the original strategy was too optimistic.",[],{"id":234,"question":400,"answer":401,"tags":402},"Does ventilation flow rate testing prove full Part F compliance on its own?","No. The airflow readings are vital, but Part F also requires proper commissioning, visual inspection, control checks and owner information. Approved Document F sets out inspection standards for background ventilators, ductwork, terminals and controls as well as the measured airflows. So a project can have a flow number on paper and still not have a complete, sign-off-ready ventilation package.",[],{"id":235,"question":404,"answer":405,"tags":406},"Are controls and commissioning checked as well as flow rates?","Yes. Approved Document F says the correct operation of control functions should be tested where practical, and it expects commissioning results to show that the system and controls are working as required. That means a proper ventilation visit is not just a hood over the grille. It is also a check that the system starts, boosts, runs down and hands over in a way the occupier can actually use.",[],{"id":236,"question":408,"answer":409,"tags":410},"Who should carry out and arrange ventilation flow rate testing?","The person carrying out the building work is responsible for ensuring the testing is arranged, but the measurement itself should be done by someone competent in Part F commissioning using the right calibrated equipment. The Approved Documents also recognise competent person self-certification routes for relevant work. On practical jobs, the safest route is a specialist who understands both the airflow measurement and the wider commissioning paperwork.",[],{"id":237,"question":412,"answer":413,"tags":414},"What paperwork has to go to Building Control after the test?","For the applicable work, the results and the data they are based on have to be recorded in the approved manner and given to the Building Control body within the required timeframe. Approved Document F says the airflows should be recorded on the commissioning sheet in Appendix C, and for new dwellings the airflow notice has to be given no later than five days after the final test.",[],{"id":238,"question":416,"answer":417,"tags":418},"Does the owner need the commissioning sheet and user information?","Yes. Approved Document F says a copy of the completed commissioning sheet should be given to the owner, along with enough operating and maintenance information to use the system effectively. For new dwellings, the Home User Guide should also include non-technical ventilation advice. That handover piece matters because a well-tested system can still perform badly if the occupier is not told how to use it.",[],{"id":239,"question":420,"answer":421,"tags":422},"Do existing dwellings need ventilation flow rate testing?","It depends on the jurisdiction and the type of work. In England’s current 2021 guidance, the specific airflow-result notice is tied to new dwellings, although mechanical systems installed in new or existing dwellings still need testing and commissioning where adjustment is possible. In Wales, the 2022 guidance says airflow rates must be measured for new dwellings and notifiable ventilation work in existing dwellings. England’s 2026 edition, which takes effect in 2027, adds clearer flow-testing guidance for certain existing-dwelling situations.",[],{"id":240,"question":424,"answer":425,"tags":426},"How does ventilation flow rate testing relate to air pressure testing?","They are separate tests, but they are closely linked. Air pressure testing measures uncontrolled leakage through the building fabric, while ventilation flow rate testing measures the purpose-provided ventilation system. Approved Document F uses airtightness thresholds to decide whether natural-ventilation guidance is appropriate, and it also notes that MVHR efficiency improves as the dwelling becomes more airtight. Build tight, ventilate right is not just a slogan; it is how the two compliance strands fit together.",[],{"id":241,"question":428,"answer":429,"tags":430},"How much does ventilation flow rate testing cost?","Cost usually depends on scope rather than one universal rate. Current UK market guidance shows very basic guide pricing from around £45 and typical pricing often starting around £40–50 per fan, but a full System 3 or System 4 commissioning job usually costs more because there are multiple terminals, balancing time and more paperwork involved. In practice, fan count, property size and whether it is a whole-house MEV or MVHR job drive the real price.",[],{"id":242,"question":432,"answer":433,"tags":434},"How quickly do you get the certificate or report?","There is no fixed statutory turnaround from the consultant, but fast reporting is the normal market expectation because the results often sit on the handover critical path. Current UK provider pages commonly advertise 24-hour or next-working-day certification once the test is complete and valid. On live projects, dependable turnaround matters just as much as the site reading.",[],{"id":243,"question":436,"answer":437,"tags":438},"Why do ventilation flow rate tests fail?","Most ventilation flow rate tests fail for practical reasons, not mysterious ones. Common causes are crushed or badly routed ductwork, terminals set wrongly, missing or closed background ventilators, power or control issues, and systems that were never properly balanced. Approved Document F’s inspection list also points to defects, wrong air direction, abnormal noise and poor installation quality as issues that affect performance. In simple terms, poor workmanship shows up quickly in the readings.",[],{"id":244,"question":440,"answer":441,"tags":442},"What are the most common system-specific reasons System 1, System 3 and System 4 fail?","System 1 commonly falls down on the wrong fan rate, missing or undersized trickle vents, and cooker hoods that do not actually extract outside. System 3 usually fails because the system has not been balanced or the background vents are wrong. System 4 often fails where supply terminals were not commissioned properly, background vents were wrongly left in, or the duct layout creates too much resistance. The underlying pattern is always the same: the installed system does not match the design intent.",[],{"id":245,"question":444,"answer":445,"tags":446},"How do you pass ventilation flow rate testing first time?","Pass first time by treating ventilation as a commissioned system, not a last-day certificate. Make sure the right system type was chosen for the dwelling airtightness, install the terminals and ductwork properly, leave background ventilators in the correct state for the system, balance System 3 and System 4 properly, and only book the test when the plot is genuinely ready. The projects that pass cleanly are usually the ones that coordinate Part F, airtightness and handover from the start.",[],[],[],[],"boxed","#0a615a","#08cf65","#ebf5f3","#8cf09b","#64748b",18,14,5,21,"widget","FAQs Styled","mb-10","faqs",{"name":16,"componentName":17,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":22,"inlineStyles":22,"bgColor":138,"group":24,"margin":22,"padding":22,"classes":22,"colSpan":22,"id":465,"originalModel":466,"borderWidth":22,"borderColor":22,"borderRadius":22,"sticky":20,"stickyTop":45,"paddingVertical":511,"stickyDisableSmall":20,"blockTemplateId":512,"block_scope":106,"blockLabel":513,"blockDescription":22,"is_block":13,"borderPosition":22,"paddingHorizontal":173,"htmlId":514,"html_id":514,"bgColorOpacity":35,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22,"equalHeightRows":20,"fillParentHeight":20},"ab4c54a2-424d-40d3-8b56-2b9ce1619d72",[467],[468,470,490],{"id":469,"colSpan":30,"colSpanSM":31,"colSpanMD":32,"colSpanLG":33,"customColSpan":20,"bgColor":22,"borderWidth":22,"borderColor":22,"borderRadius":22,"classes":22,"borderPosition":22,"bgColorOpacity":35,"bgImage":22,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22},"38e00417-c231-4100-a898-160be6ccfcf0",{"name":42,"componentName":17,"nested":13,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":22,"inlineStyles":22,"bgColor":22,"group":43,"margin":22,"padding":22,"classes":22,"colSpan":22,"id":471,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"sticky":20,"stickyTop":45,"stickyDisableSmall":20,"originalModel":472,"containerWidth":60,"paddingBottom":487,"blockTemplateId":456,"blockLabel":488,"blockDescription":22,"block_scope":489,"is_block":13,"bgColorOpacity":35,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22,"equalHeightRows":20,"fillParentHeight":20},"e5ab58a1-eda5-47c9-8ad6-0012799cb125",[473,480],[474,476],{"id":475,"colSpan":30,"colSpanSM":67,"colSpanMD":68,"colSpanLG":69,"customColSpan":20,"bgColor":22,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"classes":22,"bgColorOpacity":35,"bgImage":22,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22},"78a797e6-3478-4935-a151-81562deb50fd",{"name":51,"componentName":52,"group":53,"margin":22,"padding":22,"classes":22,"bgImage":22,"id":477,"originalModel":478},"01365215-9999-438e-901d-c595459e521f",{"proseEnabled":20,"content":479,"lineHeightClass":57,"trackingClass":58,"spacingClass":59,"margin":22,"marginSM":22,"marginMD":22,"marginLG":22,"marginTop":22,"marginTopSM":22,"marginTopMD":22,"marginTopLG":22,"marginRight":22,"marginRightSM":22,"marginRightMD":22,"marginRightLG":22,"marginBottom":22,"marginBottomSM":22,"marginBottomMD":22,"marginBottomLG":22,"marginLeft":22,"marginLeftSM":22,"marginLeftMD":22,"marginLeftLG":22,"padding":22,"paddingSM":22,"paddingMD":22,"paddingLG":22},"\u003Ch2 class=\"text-2xl md:text-3xl text-theme-dark-green font-medium mb-4\">Videos for ventilation flow rate 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>",[481,483],{"id":482,"colSpan":30,"colSpanSM":67,"colSpanMD":68,"colSpanLG":69,"customColSpan":20,"bgColor":22,"borderWidth":22,"borderPosition":22,"borderColor":22,"borderRadius":22,"classes":22,"bgColorOpacity":35,"bgImage":22,"bgImageVisibility":36,"bgImageSize":37,"bgImagePosition":38,"bgImageRepeat":39,"bgImageAttachment":40,"bgImageOpacity":35,"bgImageVisibilitySM":22,"bgImageVisibilityMD":22,"bgImageVisibilityLG":22,"bgImageSizeSM":22,"bgImageSizeMD":22,"bgImageSizeLG":22,"bgImagePositionSM":22,"bgImagePositionMD":22,"bgImagePositionLG":22},"9ae6ccd4-077d-4c48-a62a-5d38e06f29f2",{"name":51,"componentName":52,"group":53,"margin":22,"padding":22,"classes":22,"bgImage":22,"id":484,"originalModel":485},"5c8444c7-b536-45a3-a2ae-d9d84a57df3a",{"proseEnabled":13,"content":486,"lineHeightClass":57,"trackingClass":58,"spacingClass":59,"margin":22,"marginSM":22,"marginMD":22,"marginLG":22,"marginTop":22,"marginTopSM":22,"marginTopMD":22,"marginTopLG":22,"marginRight":22,"marginRightSM":22,"marginRightMD":22,"marginRightLG":22,"marginBottom":22,"marginBottomSM":22,"marginBottomMD":22,"marginBottomLG":22,"marginLeft":22,"marginLeftSM":22,"marginLeftMD":22,"marginLeftLG":22,"padding":22,"paddingSM":22,"paddingMD":22,"paddingLG":22},"\u003Cdiv 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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":545,"componentName":546,"group":53,"id":742,"originalModel":743},"f888707a-b2c9-4695-8a60-3f76536a337b",{"pageTypeId":8,"tags":744,"orderMode":553,"orderBy":554,"orderDirection":555,"manualPageIds":745,"selectedPageIds":746,"excludedPageIds":747,"autoPageOrderIds":748,"maxItems":22,"itemClass":749,"template":750,"columns":751},[],[],[],[],[],"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":8,"md":171,"sm":134},"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, 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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 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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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