--- title: "dMEV installation and extractor fan replacement — MX2 Electrical" description: "dMEV ventilation and extractor fan installation in Poole, Bournemouth and Dorset by NAPIT registered MX2 Electrical. £2m public liability insurance." canonical: "https://mx2-electrical-ltd.co.uk/services/dmev-installation" last_updated: "2026-08-25T12:53:09.068Z" --- # dMEV installation and extractor fan replacement — MX2 Electrical > dMEV ventilation and extractor fan installation in Poole, Bournemouth and Dorset by NAPIT registered MX2 Electrical. £2m public liability insurance. If persistent condensation or mould affects your property, continuous ventilation helps protect indoor air quality. MX2 Electrical supplies and installs decentralised mechanical extract ventilation units and extractor fans across Poole and Bournemouth. Every installation includes safe electrical connections from an isolation switch, ducting checks, and calibration of trickle and boost rates. ## dMEV installation cost Installation work is charged by the hour according to our standard labour rate. Overall costs depend on whether existing wiring and ducting can be reused or if new core drilling and cabling are needed. - Extractor fan and dMEV ventilation installation: £140 - Covers the electrical disconnection of old fans and connection of the new dMEV unit to an existing isolator circuit. - Covers configuring trickle rates and boost triggers during the installation visit. - Excludes the cost of the fan unit, external grilles, ducting materials, and core drilling through external walls. - Excludes running brand new electrical circuits from the consumer unit if no fan supply currently exists. ## When a dMEV fan is the right answer Intermittent extractor fans only run when switched on, often leaving damp air behind. Decentralised mechanical extract ventilation runs quietly in the background. - **Flats and converted properties:** Converted Victorian and Edwardian flats in Westbourne, Boscombe, and Ashley Cross often lack cross ventilation. A continuous low rate extract keeps moisture moving without creating draughts. - **Landlord compliance and mould control:** Rental properties facing condensation issues benefit from continuous extraction. Tenants cannot accidentally leave the fan switched off, protecting walls and ceilings from mould. - **Upgrading noisy or broken fans:** Older bathroom fans become loud and inefficient over time. Modern dMEV units use low energy DC motors that run continuously at barely audible sound levels. ## What the installation covers Every installation is completed to electrical safety standards and building regulations. ### Included in the installation - Safely isolating the existing electrical supply - Removing the redundant extractor fan unit - Installing the new dMEV fan unit - Connecting to existing local isolator switch and wiring - Connecting to existing suitable ductwork - Setting background trickle speed and boost triggers - Testing electrical safety and airflow operation ### Not included automatically - Core drilling new holes through external masonry - Installing new ducting routes through ceilings or loft spaces - Running new cable back to the main consumer unit - Plaster repair and decorative painting around old fan openings ## What happens on the day Here is what to expect when we visit to fit your extractor fan or dMEV system. 1. **Access and inspection:** We inspect the existing fan position, isolator switch, and external duct run. Please ensure clear access to the bathroom, isolation switch, and consumer unit. 2. **Fitting and connection:** We isolate the circuit, remove the old unit, mount the dMEV fan, and secure the electrical and duct connections. 3. **Commissioning and setup:** We configure the continuous trickle airflow and test the boost function before demonstrating how the unit operates. ## What you receive The visit ends with the fan running, the duct proved and the electrical work recorded. - **A fan that runs continuously:** The unit runs constantly on an energy efficient trickle setting, exchanging stale humid air for fresh air day and night. - **A duct that actually reaches outside:** We ensure your flexible or rigid ducting vents completely to the external wall or soffit grille without kinks or blockages. - **Electrical certification:** As a NAPIT registered contractor, MX2 Electrical provides appropriate certification for notifiable electrical installation work. - **Settings you understand:** We explain how the humidity sensors, timer overruns, or pull cord boost switches operate so you know what to expect. ## dMEV and extractor fan questions Common questions about installing dMEV continuous ventilation and extractor fans. ### Why do you recommend dMEV over standard intermittent extractor fans? In my experience working on homes across Poole and Bournemouth, intermittent fans only clear air while someone is in the room. A dMEV fan runs constantly on a tiny amount of power, which stops moisture from settling on cold walls in the first place. ### Can you wire a dMEV fan into my existing bathroom fan circuit? Yes, in most cases I can connect a new dMEV unit directly to your existing three pole isolator switch and lighting circuit, provided the existing wiring tests safe and sound. ### Are continuous dMEV fans noisy to live with? Modern dMEV units use quiet DC motors designed for continuous background running. On trickle speed, they typically produce sound levels below normal background room noise. ### How much electricity does a continuous extract fan use? Because they use low wattage DC motors, running a dMEV fan continuously on trickle speed consumes very little power, often just a few watts. ### Does installing an extractor fan require notification under Part P? Work within bathroom zones involving new circuits is notifiable under building regulations. MX2 Electrical is NAPIT registered and notifies all relevant work directly. ## Official ventilation guidance Official guidance covering residential ventilation standards and health regulations. - [Ventilation: Approved Document F](https://www.gov.uk/government/publications/ventilation-approved-document-f): Government statutory guidance detailing ventilation requirements and extract rates for dwellings in England. - [Damp and mould: the health risks](https://www.gov.uk/government/publications/damp-and-mould-understanding-and-addressing-the-health-risks-for-rented-housing-providers): Official government guidance on managing condensation, damp, and mould risks in rented and residential accommodation. ## Business facts - Based: Aldhelms Road, Poole, BH12 1AE - Service area: Poole, Bournemouth, Broadstone, Wimborne Minster, Wareham, Parkstone, Ferndown, Christchurch, Canford Heath, Westbourne - Hours: Every day 00:00–23:59 - Phone: +447397844504 - Email: info@mx2-electrical-ltd.co.uk - Insurance: Public liability £2,000,000 - Qualifications: Nvq level 3, City&Guilds; Gold Card Electrician - Pricing rules: Current labour rate: £70 per hour.; Materials, specialist equipment and larger project work are confirmed separately before they go ahead. ## Request a quote - [Start a request](https://mx2-electrical-ltd.co.uk/#chat): Send the job details and postcode to MX2 Electrical. ## Related pages - [Lighting Installation](https://mx2-electrical-ltd.co.uk/services/lighting-installation): Lighting installation and design. - [Electrical Fault Finding & Repair](https://mx2-electrical-ltd.co.uk/services/electrical-fault-finding): Find and repair electrical faults. - [Electric Shower Installation](https://mx2-electrical-ltd.co.uk/services/electric-shower-installation): Electric shower installation and replacement. - [House Rewiring](https://mx2-electrical-ltd.co.uk/services/house-rewiring): Full and partial house rewiring. - [Full sitemap](https://mx2-electrical-ltd.co.uk/sitemap.md): Complete machine-readable page directory.