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Mechanical ventilation with heat recovery in new homes: final report (RR8)

Ventilation and indoor air quality task group (Zero Carbon Hub)

Overview

Over the past three years, the VIAQ Task Group has been reviewing the health implications that can be associated with poor indoor air quality, against a background of new homes becoming much more airtight. Specifically we have reviewed current practice in relation to mechanical ventilation with heat recovery (MVHR) and evidence from homes in which it has been installed. This is the final report of the VIAQ task group, providing evidence to support the interim report published by the Zero Carbon Hub in January 2012.

Summary of content

Over the past three years, the VIAQ Task Group has been reviewing the health implications that can be associated with poor indoor air quality, against a background of new homes becoming much more airtight. Specifically we have reviewed current practice in relation to mechanical ventilation with heat recovery (MVHR) and evidence from homes in which it has been installed. This is the final report of the VIAQ task group, providing evidence to support the interim report published by the Zero Carbon Hub in January 2012.

Background

Ventilation (Part F) relationship with Part L 2006. Explanation of the operation of the Zero Carbon Hub VIAQ (Ventilation and indoor air quality) Task Group.

Evidence reviewed from the following projects:

  • Arun Crescent (Saxon Weald Homes)
  • Good Homes Alliance monitoring programme
  • Greenwatt Way (SSE)
  • Rowner Renewal Project (Technology Strategy Board Building Performance Evaluation)
  • Wimbish PassivHaus (Hastoe Housing Association)
  • Leeds Metropolitan University (Centre for the Built Environment)
  • Recent Dutch homes

The report gives recommendations related to:

  • Airtightness, indoor air quality and health
  • Adequacy of evidence base
  • MVHR good practice
    • Design
    • Installation
    • Commissioning
    • User instructions/maintenance
  • Source control