Continuous extract fans (dMEV) in Shropshire

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.

Shropshire has every kind of building, from old terraces to new estates and business parks, and every job is designed around the building in front of us, not a standard kit.

dMEV fans in Shropshire at a glance

Area: Shropshire
Towns listed: 12, largest Telford
Postcode districts: SY14, TF2, TF3, SY1, SY2 and DY14
Price region: West Midlands
Survey: Free survey (UK mainland)

How we do it

dMEV fans replace ordinary intermittent fans in bathrooms, kitchens, utility rooms and WCs. On trickle speed they are barely audible and use very little power; on boost they reach the higher continuous-extract rates in Approved Document F (in England, at least 13 litres a second for a kitchen, 8 for a utility room or bathroom and 6 for a WC). Landlords and housing associations often choose them because tenants cannot switch them off and forget them.

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.

Whole-home dMEV upgrade

Every wet room converted at once, with trickle vents checked in the habitable rooms.

Guide prices in Shropshire

Continuous extract fans (dMEV) guide prices in Shropshire
Work	Guide price
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£345–£595 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£145–£295 inc VAT

West Midlands rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

Signs it is time to call us

Mould keeps returning in a bathroom with a working fan
You manage rental homes and want ventilation that cannot be switched off
You are refurbishing several wet rooms at once

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. For homes, it sets minimum extract rates such as 15 litres a second for a bathroom and 30 or 60 for a kitchen, and expects mechanical systems to be airflow-tested.

How the job runs

Survey
Specify
Fit
Commission
Record

Towns we cover in Shropshire

Questions about continuous extract fans (dMEV) in Shropshire

Which rules apply to ventilation in Shropshire?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Are continuous fans noisy?

A correctly sized dMEV fan is very quiet on trickle; most people only notice it on boost. Noise usually means the wrong fan or a poor duct.

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.

Which towns in Shropshire do you cover?

All of Shropshire, including Shrewsbury, Loughton, Wellington, Oswestry and Ryton. If your town is not listed, send the postcode and we will confirm.

Are prices different in Shropshire?

Our guide prices are adjusted by region. In Shropshire we use West Midlands rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £345 to £595 inc VAT per fan.