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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>A new residential apartment block had MVHR systems installed throughout, but early signs showed future customer‑care risk: noisy valves, inconsistent airflow and rooms that did not feel properly ventilated.\u003C\u002Fp>\n\u003Cp>ATSPACE carried out MVHR commissioning support and full ventilation flow rate testing. We balanced supply and extract correctly, set accurate room‑by‑room flows, resolved the causes of noise and under‑performance, and locked in settings to prevent them being altered during snagging.\u003C\u002Fp>\n\u003Cp>The scheme met \u003Cstrong>Part F requirements\u003C\u002Fstrong> and significantly reduced the risk of post‑handover ventilation issues.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> MVHR commissioning support + ventilation flow rate testing\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Developer + principal contractor\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> Brookline Apartments, 4–28 Station Yard, Oxford OX4 2JT\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> Low‑rise apartments, 32 dwellings\u003Cbr>\u003Cstrong>Ventilation strategy:\u003C\u002Fstrong> MVHR throughout\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Commissioning + pre‑completion snagging\u003Cbr>\u003Cstrong>Compliance driver:\u003C\u002Fstrong> Approved Document F + handover quality assurance\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> MVHR flow measurement, balancing, room‑rate verification, commissioning checks, reporting\u003Cbr>\u003Cstrong>Team:\u003C\u002Fstrong> ATSPACE accredited ventilation test engineer + compliance coordinator\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why MVHR causes callbacks when not balanced properly\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>MVHR works extremely well when installed and commissioned correctly.\u003Cbr>When it isn’t, the problems appear fast — and post‑handover fixes are expensive.\u003C\u002Fp>\n\u003Cp>Common MVHR issues include:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>supply and extract out of balance\u003C\u002Fli>\n\u003Cli>incorrect valve inserts or swapped terminals\u003C\u002Fli>\n\u003Cli>unit left on default settings\u003C\u002Fli>\n\u003Cli>faulty or mis‑wired boost controls\u003C\u002Fli>\n\u003Cli>blocked or dusty filters\u003C\u002Fli>\n\u003Cli>high resistance from altered duct runs\u003C\u002Fli>\n\u003Cli>poor transfer paths causing stale rooms\u003C\u002Fli>\n\u003Cli>occupants turning units down because of noise\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>On this project, the equipment itself was fine. The issue was commissioning quality and consistency.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE was asked to do\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>confirm the MVHR systems delivered required airflow rates\u003C\u002Fli>\n\u003Cli>balance supply and extract dwelling by dwelling\u003C\u002Fli>\n\u003Cli>fix room‑rate issues without invasive rework\u003C\u002Fli>\n\u003Cli>reduce valve noise from over‑throttling\u003C\u002Fli>\n\u003Cli>provide clear commissioning and test records for handover\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What ATSPACE did\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Confirm unit setup and installation basics\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Before balancing, we checked:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>unit operation, modes and boost functions\u003C\u002Fli>\n\u003Cli>correct, clean filters installed\u003C\u002Fli>\n\u003Cli>no crushed or restricted ducting\u003C\u002Fli>\n\u003Cli>condensate configuration\u003C\u002Fli>\n\u003Cli>correct identification of supply vs extract terminals\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Small installation details have a major impact later.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Measure room‑by‑room airflow rates\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We measured and recorded flows at:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>kitchen extract\u003C\u002Fli>\n\u003Cli>bathroom\u002Fen‑suite extract\u003C\u002Fli>\n\u003Cli>utility extract\u003C\u002Fli>\n\u003Cli>living room supply\u003C\u002Fli>\n\u003Cli>bedroom supply\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>This ensured evidence‑based balancing rather than guesswork.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Balance supply and extract\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Our balancing approach:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>set unit to correct commissioning mode\u003C\u002Fli>\n\u003Cli>stabilise baseline flow\u003C\u002Fli>\n\u003Cli>adjust extract and supply valves to meet room targets\u003C\u002Fli>\n\u003Cli>confirm total supply\u002Fextract balance\u003C\u002Fli>\n\u003Cli>recheck noise levels and comfort risks\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Balancing was systematic, not reactive.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 4: Fix the real causes behind low or high flows\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Where targets couldn’t be achieved straightforwardly, we identified the underlying reason.\u003Cbr>Common causes we resolved included:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>swapped terminals\u003C\u002Fli>\n\u003Cli>wrong valve inserts\u003C\u002Fli>\n\u003Cli>duct resistance from routing issues\u003C\u002Fli>\n\u003Cli>boost configuration errors\u003C\u002Fli>\n\u003Cli>filters clogged with site dust\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>This prevented forcing airflow through over‑tightened valves.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 5: Lock in settings and protect them through snagging\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We implemented a simple rule:\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Once a dwelling is commissioned and tested, \u003Cstrong>settings are not changed\u003C\u002Fstrong> unless formally agreed and retested.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>This avoided the common scenario where settings are altered during snagging and the dwelling later “fails in use.”\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Problems faced and how they were solved\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Problem 1: Noise at valves due to over‑throttling\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> Redistributed flow through the system and reset valves to achieve targets without noise.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem 2: Supply and extract totals mismatched\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> Rebalanced dwellings and corrected unit settings to stabilise system pressure.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem 3: Boost controls not working\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> Confirmed wiring\u002Fconfiguration and ensured boost increased flows correctly.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem 4: Filters loaded with site dust\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> Ensured clean filters before commissioning and briefed the site team on filter impact.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Outcome\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The scheme achieved \u003Cstrong>stable MVHR performance\u003C\u002Fstrong>, balanced supply and extract, and fully compliant Part F flow rates.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Project gains\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>fewer post‑handover ventilation complaints\u003C\u002Fli>\n\u003Cli>reduced risk of noisy valves\u003C\u002Fli>\n\u003Cli>improved consistency across apartments\u003C\u002Fli>\n\u003Cli>clear commissioning and test evidence for handover\u003C\u002Fli>\n\u003Cli>a repeatable approach for future blocks\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Common mistakes this project avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>over‑tightening valves to “chase numbers”\u003C\u002Fli>\n\u003Cli>commissioning with clogged or missing filters\u003C\u002Fli>\n\u003Cli>leaving the unit on default settings\u003C\u002Fli>\n\u003Cli>failing to verify boost performance\u003C\u002Fli>\n\u003Cli>allowing settings to be altered after commissioning\u003C\u002Fli>\n\u003Cli>assuming low flow = valve issue (often it’s duct resistance)\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If you need MVHR systems that work \u003Cstrong>in real life\u003C\u002Fstrong>, ATSPACE will balance supply and extract properly, verify room‑by‑room rates, and provide clear evidence for compliance and handover.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Ask for\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>MVHR commissioning and flow rate testing\u003C\u002Fli>\n\u003Cli>supply\u002Fextract balancing and room‑rate verification\u003C\u002Fli>\n\u003Cli>investigation of noisy valves and underperforming rooms\u003C\u002Fli>\n\u003Cli>clear reporting for compliance and handover\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently asked questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Why does MVHR need balancing if installed correctly?\u003C\u002Fstrong>\u003Cbr>Because duct resistance and valve settings vary — balancing ensures each room receives the intended airflow.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>What causes MVHR noise complaints most often?\u003C\u002Fstrong>\u003Cbr>Over‑throttled valves, high‑resistance duct routes, incorrect inserts and unsuitable fan settings.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can MVHR be 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