Mechanical Extract Ventilation (MEV)

Continuously extracts polluted and moist air from wet rooms

Can be discreetly positioned (e.g. cupboard, utility room, loft space)

Maintains indoor air quality

It can be common in modern, air-tight properties for a buildup of condensation, mould and stale air can negatively impact the health of occupants and the fabric of the home. Installing an energy efficient Mechanical Extract Ventilation (MEV) system will effectively help to remove these pollutants and maintain a healthy indoor air quality.

How does it work?

Also referred to as System 3 in Approved Document F of the Building Regulations, an MEV system consists of a centralised ventilation unit that continuously extracts waste, polluted and moist air from wet rooms and can be discreetly positioned in either a cupboard, utility room, ceiling or loft space.

An MEV system can be ducted throughout the dwelling and operated by the homeowner through a range of control options. Typically dual speed, MEV systems provide both low speed continuous trickle ventilation and high speed boost flow when required.

Replacement fresh air is drawn into the dwelling through background ventilators i.e. air inlets, located in the living areas.

What can MEV do for me?

  • Improves indoor air quality through continuous ventilation
  • Delivers quicker installation with minimum hassle
  • Helps reduce the Dwelling Emission Rate (DER) to secure additional SAP points
  • Provides peace of mind that the unit’s performance complies with Building Regulations
  • Fits easily into joist spaces

SAP ratings

As an added benefit to developers, specifiers and self-builders, incorporating an MEV system will also help to lower Dwelling Emission Rates (DER) and therefore provide higher SAP ratings.

For those looking to further improve their DER and integrate heat recovery into a centralised extract system, please see xxxxxxxxxx.