Continuous extract fans (dMEV) in South Yorkshire

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.

We carry out continuous extract fans (dMEV) across South Yorkshire, including Sheffield, Rotherham, Doncaster, Barnsley and Bentley. Prices use Yorkshire rates. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

dMEV fans in South Yorkshire at a glance

Area: South Yorkshire
Towns listed: 27, largest Sheffield
Postcode districts: DN1, DN5, S7, S8, S61 and S62
Price region: Yorkshire
Survey: Free survey (UK mainland)

What continuous extract fans (dMEV) involves

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.

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.

Commissioned and recorded

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

Guide prices in South Yorkshire

Continuous extract fans (dMEV) guide prices in South Yorkshire
Work	Guide price
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£325–£550 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£135–£275 inc VAT

Guide prices using Yorkshire rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Signs it is time to call us

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

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). 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 South Yorkshire

Questions about continuous extract fans (dMEV) in South Yorkshire

Which towns in South Yorkshire do you cover?

All of South Yorkshire, including Sheffield, Rotherham, Doncaster, Barnsley and Bentley. If your town is not listed, send the postcode and we will confirm.

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.

Are prices different in South Yorkshire?

Our guide prices are adjusted by region. In South Yorkshire we use Yorkshire rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £325 to £550 inc VAT per fan.

Is the survey free in South Yorkshire?

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.