Heat Recovery (MVHR)

What is a heat recovery ventilation system?

It is a continuous supply of fresh air drawn into the property via a very low energy ventilation unit, positioned in the roof space or the utility area of the building. The ventilation unit filters the incoming air and removes any pollutants and insects. By using the extracted air from the wet room ie bathrooms, kitchens, wc’s and utility areas the warm stale air is continuously drawn out and filtered back through to the ventilation unit where the heat from this air is exchanged with the fresh incoming air. As the clean fresh air is heated by the exhausted damp stale air up to 97% of the heat can be recovered which will be off set against heating costs and will reduce heating bills. A standard extract fan will vent warm air to the atmosphere. The property will then have a higher energy efficiency rating and comply with current building regulations. This is calculated by using the SAP appendix Q. (See below)

The benefits of MVHR

  • Constant clean, fresh filtered air reduces symptoms for asthma and allergy suffers.
  • Improves indoor air quality throughout.
  • Contributes to the energy efficiency of the home.
  • Enhances heat distribution.
  • Reduces/ eliminates surface condensation.
  • Eliminates mould and mildew.
  • Stops streaming windows.
  • Removes musty odours.
  • Aids radon dispersion.

How is it installed?

A MVHR system should be designed for each specific property and can only be installed by a Bpec approved installer. it uses a series of insulated pipe work ducted around the building. Some taking the stale damp air out, and some bringing the clean heated fresh air into the living areas, all flowing and returning to and from the heat recovery ventilation unit suitably positioned within the property.

By using discreet ceiling outlets with adjustable flow restrictors to allow the room to be maintained  at the perfect ambient temperature for the environment.


What is SAP appendix Q

SAP is the Governments standard assessment procedure for the energy rating of the dwelling.

The SAP (standard assessment procedure) calculates a rating for the energy cost due to the built structure of the property and its heating system, internal lighting and any renewables energy technologies used in the property.

It is used to give homes an energy rating and be carried out on new and existing property’s. All ventilation system must be SAP appendix Q listed to comply with building regs, and keep your energy rating up. Also any ventilation system must be fitted and commissioned by a BPEC qualified installer.

Contact us for a quotation