MVHR (Mechanical Ventilation with Heat Recovery) is a whole-dwelling ventilation system found in new-build flats and airtight modern homes across London. It extracts stale air from wet rooms, recovers up to 92% of the heat from it, and supplies fresh pre-warmed air to living spaces. Building Regulations Approved Document F (2021 edition, effective June 2022) requires MVHR systems to be maintained to achieve their designed ventilation rates. Annual professional servicing should cover G4 and F7 filter replacement, heat exchanger inspection, fan motor check, condensate drain clearance, summer bypass damper test, and system airflow calibration. Filters in London properties should be checked every three to six months given variable outdoor air quality. A neglected MVHR can drop below 40% heat recovery efficiency; elevated indoor CO₂ levels and persistent condensation follow, creating the damp and mould conditions that constitute a HHSRS hazard — a direct legal risk for landlords.
What a Well-Maintained MVHR System Delivers
MVHR is only as effective as its maintenance schedule. Here's what regular servicing protects.
Ultra-Quiet Operation
Professional maintenance keeps fan motors balanced and whisper-quiet
Prevents Overheating
Clean systems provide effective summer bypass cooling (purge ventilation)
Controls Damp
Optimal humidity control through efficient heat recovery
Reduces Condensation
Prevents the condensation that leads to mould and structural damage
Cleaner Air
Clean filters ensure maximum filtration of pollutants, allergens, and contaminants
MVHR Servicing for Every Property Type
Homeowners
Breathe cleaner air and reduce energy bills
Landlords
Meet ventilation compliance for new-build properties
Property Developers
Maintain system warranties and handover quality
Facilities Managers
Manage multi-unit MVHR systems efficiently
MVHR Filter: Before & After Servicing
Before: blocked, efficiency <40%
After: clean, up to 92% heat recovery
What You Get After a Professional MVHR Service
Cleaner Air
99.9%
Pollutants filtered
Lower Bills
92%
Heat recovery restored
Quieter Operation
Whisper
Balanced, quiet fans
Service Guarantee
12 mo
Warranty on all work
What Our MVHR Service Includes
Annual Professional Service
- G4 & F7 filter replacement (both supply and extract)
- Heat exchanger deep clean
- Fan motor inspection & balancing
- Condensate drain clearance
- Ductwork connections check
- Summer bypass valve test
- System airflow calibration
- Service report & next visit reminder
MVHR Brands We Service
- Zehnder ComfoAir / Paul Novus
- Vent-Axia Lo-Carbon Kinetic
- STIEBEL ELTRON LWZ
- Brink Flair / Renovent
- Nuaire MRXBOX / Drimaster
- Genvex / Domekt
- All other major manufacturers
Cost of neglect: Filter replacement costs £40–100 per set. Annual professional service costs £150–300. System neglect can lead to motor replacements costing £1,500–3,500.
