Home ventilation, County Down
Continuous extract fans (dMEV) in County Down
Quiet low-energy fans that run all the time and boost automatically when humidity rises, across County Down.
- From £315 inc VAT per fan
- By arrangement
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.
County Down 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 County Down at a glance
- Area
- County Down, Northern Ireland
- Towns listed
- 8, largest Bangor
- Postcode districts
- BT5, BT3, BT4, BT30, BT19 and BT20
- Price region
- Northern Ireland
- Survey
- By arrangement, travel quoted first
How we do it
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.
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 County Down
| Work | Guide price |
|---|---|
| Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan) | £315–£550 inc VAT |
| Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home) | £135–£270 inc VAT |
Northern Ireland rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job. Travel is quoted separately for this area.
Signs it is time to call us
- An energy retrofit has made the house more airtight
- Building control has asked for continuous extract
- Occupants switch fans off because of noise
Rules in Northern Ireland
In Northern Ireland, ventilation is covered by the Building Regulations (Northern Ireland) and Technical Booklet K. We design to the Northern Ireland guidance and measure the airflow achieved.
How the job runs
- Survey
- Specify
- Fit
- Commission
- Record
Towns we cover in County Down
Questions about continuous extract fans (dMEV) in County Down
Which towns in County Down do you cover?
All of County Down, including Banbridge, Dundonald, Holywood, Downpatrick and Bangor. If your town is not listed, send the postcode and we will confirm.
Is it expensive to run a fan all the time?
No. dMEV fans use very little electricity on trickle speed, typically a few watts, so running costs are low compared with the condensation and mould they prevent.
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.
Are prices different in County Down?
Our guide prices are adjusted by region. In County Down we use Northern Ireland rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £315 to £550 inc VAT per fan.
Is the survey free in County Down?
Visits here are by arrangement. Because of the ferry or long travel involved, we quote travel separately and in writing before you commit, and we can often combine visits to keep the cost down.
Other services in County Down
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.