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Background Ventilation Testing Found the Installation Issue","trickle-vents-not-working-background-ventilation-testing-found-the-installation-issue","\u002Fcase-studies\u002Ftrickle-vents-not-working-background-ventilation-testing-found-the-installation-issue",true,[15,74],{"name":16,"componentName":17,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":9,"inlineStyles":9,"bgColor":22,"group":23,"margin":9,"padding":9,"classes":24,"colSpan":9,"id":25,"originalModel":26,"borderWidth":66,"borderColor":67,"borderRadius":9,"paddingVertical":68,"blockTemplateId":69,"block_scope":70,"blockLabel":71,"blockDescription":9,"is_block":13,"paddingHorizontalSM":9,"paddingHorizontal":72,"sticky":20,"stickyTop":65,"stickyDisableSmall":20,"borderPosition":73},"Container","ColContainer","grid-cols-1","md:grid-cols-12",false,"w-full","#ebf5f3","main","pattern_bg","f1bcde02-fe0a-4831-8ef7-833d9f4fbb17",[27],[28,34],{"colSpan":29,"colSpanSM":30,"colSpanMD":31,"colSpanLG":32,"customColSpan":20,"bgColor":9,"borderWidth":9,"borderColor":9,"borderRadius":9,"classes":9,"id":33,"borderPosition":9},"col-span-1","sm:col-span-12","md:col-span-12","lg:col-span-12","608d7c62-4a53-4ecd-90e5-9a4d00eaa4ad",{"name":35,"componentName":17,"nested":13,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":9,"inlineStyles":9,"bgColor":9,"group":36,"margin":9,"padding":9,"classes":9,"colSpan":9,"id":37,"originalModel":38,"borderWidth":9,"borderColor":9,"borderRadius":9,"containerWidth":64,"sticky":20,"stickyTop":65,"stickyDisableSmall":20,"borderPosition":9},"Nested Container","main_nested","877549aa-8bc7-474b-8261-ce43bdf39dfd",[39,55],[40,45],{"colSpan":29,"colSpanSM":41,"colSpanMD":42,"colSpanLG":43,"customColSpan":20,"bgColor":9,"borderWidth":9,"borderColor":9,"borderRadius":9,"classes":9,"id":44,"borderPosition":9},"sm:col-span-6","md:col-span-6","lg:col-span-6","f5aab5dd-4d72-423a-87fb-ae305112af49",{"name":46,"componentName":47,"group":48,"margin":9,"padding":9,"classes":9,"bgImage":9,"id":49,"originalModel":50},"WYSIWYG Editor","Wysiwyg","content","ee86e31b-348d-41ae-aea6-b0a20400b9d2",{"proseEnabled":20,"content":51,"lineHeightClass":52,"trackingClass":53,"spacingClass":54},"\u003Ch1 class=\"text-4xl md:text-5xl text-theme-dark-green font-medium mb-10 md:mb-0\" style=\"text-align: left;\">Trickle Vents Not Working? Background Ventilation Testing Found the Installation Issue\u003C\u002Fh1>","leading-relaxed","tracking-normal","[&_p]:my-0 [&_p+p]:mt-4",[56,58],{"id":57,"colSpan":29,"colSpanSM":41,"colSpanMD":42,"colSpanLG":43,"customColSpan":20,"bgColor":9,"borderWidth":9,"borderColor":9,"borderRadius":9,"classes":9,"borderPosition":9},"517a151c-2154-4782-b41c-3b767f63208b",{"name":59,"componentName":60,"group":48,"margin":9,"padding":9,"classes":9,"bgImage":9,"id":61,"originalModel":62},"HTML Block","HtmlBlock","8817ddf4-0530-4257-a85f-c50e6dae808f",{"html":63,"wrapperClasses":9,"contentClasses":9},"\u003Cdiv class=\"relative flex justify-center md:justify-end\">\n  \u003C!-- wrapper controls overall size -->\n  \u003Cdiv class=\"relative w-full max-w-[560px]\">\n    \u003C!-- Pattern layer -->\n    \u003Cdiv class=\"pattern-bg-case-study absolute -inset-6 rounded-2xl\" aria-hidden=\"true\">\u003C\u002Fdiv>\n\n    \u003C!-- Green slab (offset behind image) -->\n    \u003Cdiv\n      class=\"absolute left-0 top-6 h-[260px] w-[320px] rounded-2xl bg-emerald-500\"\n      aria-hidden=\"true\"\n    >\u003C\u002Fdiv>\n\n    \u003C!-- Image -->\n    \u003Cdiv class=\"relative ml-0 md:ml-10 mt-0 overflow-hidden rounded-2xl\">\n      \u003Cimg\n        src=\"{{feature_image}}\"\n        alt=\"Case study feature\"\n        class=\"block h-[260px] w-full object-cover\"\n      \u002F>\n    \u003C\u002Fdiv>\n  \u003C\u002Fdiv>\n\u003C\u002Fdiv>","max-w-6xl mx-auto",0,"border-2","05871b","py-16",12,"standard","Our Services - Green block with bg pattern","px-7","border-b",{"name":16,"componentName":17,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":9,"inlineStyles":9,"bgColor":9,"group":23,"margin":9,"padding":9,"classes":9,"colSpan":9,"id":75,"originalModel":76,"borderWidth":9,"borderColor":9,"borderRadius":9,"sticky":20,"stickyTop":65,"stickyDisableSmall":20,"paddingVertical":90,"borderPosition":9,"paddingHorizontal":91},"0634e860-5bb2-42de-aa57-b2272d325b7a",[77],[78,80],{"id":79,"colSpan":29,"colSpanSM":30,"colSpanMD":31,"colSpanLG":32,"customColSpan":20,"bgColor":9,"borderWidth":9,"borderColor":9,"borderRadius":9,"classes":9,"borderPosition":9},"769b7f36-06b0-4bcc-9fc7-b1935051d677",{"name":35,"componentName":17,"nested":13,"cols":18,"colsMD":19,"customColSpan":20,"parentAlign":21,"bgImage":9,"inlineStyles":9,"bgColor":9,"group":36,"margin":9,"padding":9,"classes":9,"colSpan":9,"id":81,"originalModel":82,"borderWidth":9,"borderColor":9,"borderRadius":9,"sticky":20,"stickyTop":65,"stickyDisableSmall":20,"containerWidth":64,"borderPosition":9},"e7c2eabd-f877-467a-89f0-aa8ef8b7f411",[83],[84,86],{"id":85,"colSpan":29,"colSpanSM":30,"colSpanMD":31,"colSpanLG":32,"customColSpan":20,"bgColor":9,"borderWidth":9,"borderColor":9,"borderRadius":9,"classes":9,"borderPosition":9},"c37da2da-dc4c-4238-938b-031fe5501f7d",{"name":46,"componentName":47,"group":48,"margin":9,"padding":9,"classes":9,"bgImage":9,"id":87,"originalModel":88},"30243da6-e294-4dbe-9226-f959bbb2a3d8",{"proseEnabled":13,"content":89,"lineHeightClass":52,"trackingClass":53,"spacingClass":54},"\u003Cdiv class=\"et_pb_column et_pb_column_2_3 et_pb_column_2_tb_body  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_post_content et_pb_post_content_0_tb_body\">\n\u003Cdiv>\n\u003Ch2>\u003Cstrong>The result\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The site team kept receiving the same complaint during internal QA and early occupation:\u003Cbr>Rooms felt stale, windows were streaming, and trickle vents seemed to “do nothing.”\u003C\u002Fp>\n\u003Cp>Although vents were fitted, the homes were behaving as if no background ventilation existed.\u003Cbr>ATSPACE carried out background ventilation testing, traced the issue to a \u003Cstrong>repeat installation fault\u003C\u002Fstrong> at the vent airway, and provided a fast, repeatable fix.\u003C\u002Fp>\n\u003Cp>Once corrected, airflow and vent operation improved across all affected plots, reducing moisture risk and preventing a wider customer‑care issue.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Background ventilation testing + defect investigation\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Main contractor + window installation contractor\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> Fernwood Grove, Plots 31–46, 7 Maple Rise, Derby DE21 4LQ\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> New build houses, two storey, high‑airtightness fabric\u003Cbr>\u003Cstrong>Ventilation strategy:\u003C\u002Fstrong> System 3 MEV with background ventilators\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Late completion + early occupation\u003Cbr>\u003Cstrong>Compliance driver:\u003C\u002Fstrong> Approved Document F + post‑completion QA\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Vent function checks, airway checks, fault investigation, fix plan, verification checks, written summary\u003Cbr>\u003Cstrong>Team:\u003C\u002Fstrong> ATSPACE compliance engineer + site coordinator\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What the site was seeing\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Symptoms were consistent across plots:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>trickle vents stiff or jammed\u003C\u002Fli>\n\u003Cli>vents opened but airflow felt weak or absent\u003C\u002Fli>\n\u003Cli>rapid condensation in bedrooms on cold mornings\u003C\u002Fli>\n\u003Cli>rooms feeling stuffy even with MEV fans running\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>With high‑airtightness homes, background ventilators matter even more — if they fail, the \u003Cstrong>entire ventilation strategy is compromised\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why this matters commercially\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Non‑functioning trickle vents create:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>mould and condensation complaints\u003C\u002Fli>\n\u003Cli>reputational risk\u003C\u002Fli>\n\u003Cli>high volumes of repeat callbacks\u003C\u002Fli>\n\u003Cli>disputes between installers, decorators and M&E\u003C\u002Fli>\n\u003Cli>residents closing or disabling ventilation systems due to discomfort\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The contractor needed a \u003Cstrong>definitive cause\u003C\u002Fstrong> and a fix that could be rolled out quickly across the phase.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE did\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Confirm ventilation strategy and expected provision\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We confirmed the homes relied on trickle vents as part of the System 3 MEV strategy — making vent performance critical.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Test a representative sample\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We tested multiple plots across streets and house types to check if the issue was isolated or systemic.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Functional vent checks\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>In every affected room, we checked:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>smooth opening\u002Fclosing\u003C\u002Fli>\n\u003Cli>slider obstruction from paint or sealant\u003C\u002Fli>\n\u003Cli>visible blockages at the outlet\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 4: Airway checks (the real cause)\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>This is where most issues originate. We checked:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>whether the vent airway was clear\u003C\u002Fli>\n\u003Cli>external slot unobstructed\u003C\u002Fli>\n\u003Cli>internal finish not blocking airflow\u003C\u002Fli>\n\u003Cli>no protective film\u002Ffoam left in place\u003C\u002Fli>\n\u003Cli>vent fitted correctly for frame type\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 5: Identify the repeat installation issue\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We found a \u003Cstrong>consistent installation fault\u003C\u002Fstrong>:\u003Cbr>The vent airway was partially obstructed at the window‑head detail.\u003Cbr>This made the vent look correct but operate incorrectly.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 6: Provide a repeatable fix + verify\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We issued a simple, fast fix that could be applied across affected plots, then returned to verify airflow improvement.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The root cause and the fix\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Root cause\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The vents were installed, but the airflow path was blocked by a repeated finishing detail at the frame head.\u003Cbr>The vent “looked fine,” but in reality the airway was choked.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Fix\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The contractor:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>corrected the interface detail\u003C\u002Fli>\n\u003Cli>ensured the airway was fully open\u003C\u002Fli>\n\u003Cli>confirmed the vent outlet was not sealed by trim\u003C\u002Fli>\n\u003Cli>checked operation after fix\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The method was then rolled out across all plots with the same detail.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Outcome\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>After correction, the site saw immediate improvements:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>vents operated smoothly\u003C\u002Fli>\n\u003Cli>airflow increased noticeably\u003C\u002Fli>\n\u003Cli>reduced condensation risk\u003C\u002Fli>\n\u003Cli>fewer early‑stage complaints\u003C\u002Fli>\n\u003Cli>repeat defect removed from the build process\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The window installer and finishing teams also gained a clear QA checkpoint to prevent the issue recurring.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Common mistakes this project avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>replacing vents even though vents weren’t the problem\u003C\u002Fli>\n\u003Cli>blaming resident behaviour instead of checking airflow\u003C\u002Fli>\n\u003Cli>sealing visible edges while leaving the airway blocked\u003C\u002Fli>\n\u003Cli>treating condensation as a heating issue rather than a ventilation issue\u003C\u002Fli>\n\u003Cli>fixing only one plot without addressing repetition across the phase\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If your trickle vents are fitted but \u003Cstrong>not working\u003C\u002Fstrong>, ATSPACE background ventilation testing will identify whether the problem is the vent, the airway, or the finishing detail — and provide a fast, repeatable fix plan.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Ask for:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>investigation of trickle vents not working\u003C\u002Fli>\n\u003Cli>background ventilation testing across sample or full plots\u003C\u002Fli>\n\u003Cli>repeat‑defect fix plans for window\u002Ffinishing details\u003C\u002Fli>\n\u003Cli>verification checks after corrective works\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently asked questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Why do trickle vents sometimes feel like they do nothing?\u003C\u002Fstrong>\u003Cbr>Because the airway can be blocked by finishing materials or incorrect installation, even when the vent looks correct.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can a blocked trickle vent cause condensation?\u003C\u002Fstrong>\u003Cbr>Yes — without background ventilation, moisture builds quickly, especially overnight.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Is the issue usually the installer or the finisher?\u003C\u002Fstrong>\u003Cbr>It can be either. 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