Frequently Asked Questions

We carry out MVHR and ductwork installations across London and the surrounding Home Counties. Get in touch with your postcode and we'll confirm coverage for your project.

Yes. Every project starts with a free, no-obligation site survey so we can design a system that fits your property before providing a quote.

Our design stage includes a site survey, a duct route plan tailored to your property's joists and ceiling voids, unit and grille positioning agreed with you, and airflow calculations to confirm Building Regulations Part F compliance before any work starts on site.

MVHR works best in reasonably airtight properties, which makes it ideal for new builds, extensions and well-insulated refurbishments. We assess airtightness and insulation levels as part of our free site survey to confirm whether MVHR is the right fit, or whether another ventilation strategy would suit your property better.

MVHR maintenance is straightforward: filters typically need changing every six to twelve months, and we recommend a professional service every one to two years to check airflow rates and clean the unit's internal components.

Most single-home installations take one to three weeks on site. Larger residential and commercial projects vary depending on scale and how installation is sequenced with the wider build programme.

Yes. Every system we install is commissioned and airflow-tested to meet Building Regulations Part F, with full documentation provided for building control sign-off.

MEV — mechanical extract ventilation — is a system that removes stale, moist, or polluted air from multiple rooms through a central extract fan and duct network, typically without heat recovery on the extract side. It is commonly used where continuous extract from wet rooms (bathrooms, kitchens, utility spaces) is required across a dwelling or commercial unit. Domani Ventilation designs and installs MEV systems alongside MVHR where project requirements, building layout, or regulations call for multi-room extract rather than whole-house heat recovery. If you are unsure which approach suits your property, we confirm the right strategy during a [free site survey](/contact).

**MVHR (Mechanical Ventilation with Heat Recovery)** supplies fresh filtered air to habitable rooms while extracting stale air from wet rooms, recovering heat from the outgoing airstream to pre-warm incoming air. It suits airtight, well-insulated homes and developments where energy efficiency and whole-house ventilation are priorities. **MEV (Mechanical Extract Ventilation)** focuses on extracting air from multiple rooms through a shared duct system, without recovering heat from the extracted air. It is often specified where extract-only ventilation meets the design brief or where MVHR is not the preferred solution. Many projects require careful coordination between supply, extract, and duct routing. We advise on MVHR, MEV, or combined strategies based on your property type, occupancy, and Building Regulations Part F requirements.

Yes. Domani Ventilation Services Ltd employs **NICEIC-certified** engineers for electrical and mechanical safety on ventilation installations, and our ventilation specialists hold **BPEC qualifications** for mechanical ventilation work. We are **fully insured** for residential and commercial projects across London and Greater London, including large-scale apartment schemes and mixed-use developments. Commissioning documentation is provided to support Building Regulations sign-off and client handover.

In many cases, yes. We provide standalone **MVHR commissioning**, airflow testing, balancing, and certification for systems installed by other contractors — subject to a site survey to confirm the installation is complete and safe to test. Commissioning verifies that supply and extract rates meet design intent and Part F requirements, identifies imbalances or restrictions, and produces documentation for building control or warranty purposes. See our [commissioning and servicing service](/services/mvhr-systems-commissioning-and-servicing) or [book a service visit](/servicing).

We specify equipment to match each project's performance, acoustic, and programme requirements. Manufacturers we regularly install and commission include: - **Nuaire** — widely used on large residential and community schemes - **Vectaire** — heat recovery units for residential and mixed-use applications - **Mitsubishi Electric** — commercial and residential heat recovery systems - **Verplas** — plastic and pre-insulated ductwork components Ductwork, plenum boxes, fan coil units, fire dampers, and acoustic lagging (such as **Armaflex** insulation) are selected to suit the building type and design package. Equipment choice is confirmed during design and survey — not before we understand your property.

Yes. We supply and install **commercial metal ductwork** — rectangular, spiral, and pre-fabricated runs — for offices, mixed-use schemes, hospitality venues, education buildings, gyms, and healthcare-related spaces across London and Greater London. Our commercial ductwork service is coordinated with wider M&E programmes and includes routing, supports, connections to MVHR or extract plant, fire dampers where required, and commissioning. Learn more on our [commercial ductwork page](/services/commercial-ductwork-supply-and-installation).

Yes, in many cases. MVHR can be retrofitted into existing homes, extensions, and refurbishment projects where ceiling voids or routed duct paths allow discreet installation. Success depends on property layout, airtightness, insulation levels, and access for duct routing. We assess feasibility during a **free site survey** and recommend MVHR, MEV, or alternative ventilation only where it will perform effectively for your home. Typical retrofit programmes coordinate ductwork with other building works to minimise disruption. Most single-home installs take **one to three weeks** on site depending on scope.

Filter replacement intervals depend on the manufacturer, filter grade, occupancy, and local air quality. As a general guide: - **Supply and extract filters** — typically every **6 to 12 months** in occupied homes, or sooner in dusty or high-traffic environments - **Professional MVHR service** — we recommend a **full service every one to two years** (or every six months on demanding commercial or high-occupancy systems) to verify airflow, clean components, and confirm efficient operation We provide filter guidance at handover and can include filter replacement within a [planned service visit](/servicing).