Continuous extract fans (dMEV) in Greater Manchester

A dMEV (decentralised mechanical extract ventilation) fan is a low-energy extract fan that runs continuously at a quiet trickle speed and boosts automatically when it senses humidity or a light switch. Because it never fully switches off, moisture is removed steadily instead of building up between showers.

Our team is based in Great Barr, Birmingham, and we work throughout Greater Manchester, from Sale, Manchester, Oldham, Wigan and Bolton. Surveys for new installations are free on the UK mainland, with a written quote afterwards.

dMEV fans in Greater Manchester at a glance

Area: Greater Manchester
Towns listed: 66, largest Manchester
Postcode districts: BL0, SK1, SK2, M23, WA14 and M12
Price region: North West
Survey: Free survey (UK mainland)

What the work involves

Landlords and housing associations often choose them because tenants cannot switch them off and forget them. Under Approved Document F, continuous mechanical extract systems need commissioning: the airflow on both trickle and boost is measured and recorded. We do that as part of the job, so you have a record for building control, a landlord file or a future buyer.

Commissioned and recorded

Trickle and boost rates measured and written on a commissioning sheet.

Bathroom and en-suite

Through-wall or ceiling fans with humidity-controlled boost.

Kitchen

Higher-rated continuous fans where a ducted hood is not practical.

Guide prices in Greater Manchester

Continuous extract fans (dMEV) guide prices in Greater Manchester
Work	Guide price
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£330–£575 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£140–£280 inc VAT

These ranges use our North West rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

Common reasons people call

You manage rental homes and want ventilation that cannot be switched off
You are refurbishing several wet rooms at once
An energy retrofit has made the house more airtight

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.

How the job runs

Survey
Specify
Fit
Commission
Record

Towns we cover in Greater Manchester

Questions about continuous extract fans (dMEV) in Greater Manchester

Which towns in Greater Manchester do you cover?

All of Greater Manchester, including Sale, Manchester, Oldham, Wigan and Bolton. If your town is not listed, send the postcode and we will confirm.

What is the difference between dMEV and MEV?

dMEV uses one small fan in each wet room. MEV uses one central fan, usually in the loft, ducted to all the wet rooms. Both run continuously.

Do I still need trickle vents?

Yes. With continuous extract, Approved Document F still expects background ventilators in habitable rooms so replacement air can get in.

Are prices different in Greater Manchester?

Our guide prices are adjusted by region. In Greater Manchester we use North West rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £330 to £575 inc VAT per fan.

Is the survey free in Greater Manchester?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.