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Central Extract Ventilation (MEV) is a whole house ventilation methodology ideal for new build apartments and houses. Consisting a centrally mounted extraction unit, usually located in a loft space or cupboard, it is then ducted around the house to each wet room (bathroom, kitchen) where a ceiling valve acts as the point of extraction.
Central Extract or MEV is a recognised ventilation methodology (System 3) in ADF:2010 and a proven low energy and efficient way of ventilating a new or existing dwelling
The Building Regulation ADF: 2010 set out the airflow requirements for System 3 MEV Whole House Extract Ventilation in the table below (using the continuous extract airflow rates)
In order to calculate the airflow rates for a particular dwelling and specify a unit you need to know the following information:
1. Design Criteria e.g. >5ach @ 50Pa or <5ach @ 50Pa2. Floor Area of Dwelling3. No of wet rooms4. No of occupants
Background Ventilators: In order to ensure replacement air and cross ventilation throughout the property dwellings which have a higher insulated design criteria of <5ach@50Pa will require 2500mm2 equivalent area per habitable room.
