Explanation courtesy of Greenwood Airvac
'dMEV DeCentralised Mechanical Extract (System 3) is a whole house ventilation methodology which consists of continuously running extract fans and background ventilators (where applicable)
It works on the same basis as a continuously running central system (MEV) but is a local, in room approach. Fans are located in every wet room and run continously at low trickle speeds and then boost as required via light switch or homeowner control.'
Models fitted with humidity sensors will boost automatically.
dMEV fans are particularly suited for refurbishmant and social housing applications.