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Zehnder ComfoAir Q450 MVHR Unit – 471502019
Zehnder ComfoAir Q450 MVHR heat recovery unit – up to 450 m³/h
The Zehnder ComfoAir Q450 is a whole-house mechanical ventilation with heat recovery (MVHR) unit from Zehnder, delivering filtered fresh air to living rooms and bedrooms and extracting from kitchens and bathrooms.
It is designed for airtight, energy-efficient homes, and can be wall or floor mounted.
Key features
- Airflow: 450 m³/h max @100–200 Pa (datasheet range 70–345 m³/h)
- Heat recovery: 93% at 70% flow/50 Pa; 96% heat recovery (UK datasheet)
- World-class 96% heat recovery
- 100% filtered modulating summer bypass
- software L/R handing
- commissioning wizard
- constant-flow fans
The unit measures 850 × 725 × 570 mm (H×W×D), weighs 46 kg (zehnder.co.uk) / 50 kg (UK datasheet), has 180 mm internal / 200 mm external duct connections.
Controls: Front LCD display; ComfoSense C, ComfoConnect LAN/PRO (app, KNX/Modbus) options; humidity boost. Filters: ISO Coarse 65% (G4) supply & extract; ISO ePM1 (F7) optional. Single UK model; left/right orientation reversible in software – no separate L/R article numbers
Every MVHR system should be designed around the dwelling's ventilation rates, with insulated ducting on the outside-air and exhaust runs. We can supply matching ducting, filters and controls. Specifications are taken from the manufacturer's published data.
Supplied by Low Cost Renewables at trade prices, with delivery across the UK and Ireland.
Zehnder ComfoAir Q450 specifications
| Max airflow | 450 m³/h max @100–200 Pa (datasheet range 70–345 m³/h) |
|---|---|
| Heat recovery efficiency | 93% at 70% flow/50 Pa; 96% heat recovery (UK datasheet) |
| SFP / SPI | 0.48 W/(l/s); Appendix Q K+ 0.48–0.68 (2009) / 0.53–1.04 (2012) |
| Dimensions | 850 × 725 × 570 mm (H×W×D) |
| Weight | 46 kg (zehnder.co.uk) / 50 kg (UK datasheet) |
| Duct spigots | 180 mm internal / 200 mm external |
| Power | 143 W at max flow @100 Pa; 250 W max excl. 2.0 kW pre-heater; 230 V |
| Bypass | Yes – 100% filtered modulating summer bypass |
| Filters | ISO Coarse 65% (G4) supply & extract; ISO ePM1 (F7) optional |
| Handing | Single UK model; left/right orientation reversible in software – no separate L/R article numbers |
| Passivhaus | Not stated on UK page (Passive House listed as an application only) |
| SAP PCDB / Appendix Q | Yes – SAP Appendix Q / PCDB K+ data on datasheet; ErP A / A+ |
| Noise | 45 dB(A) (SAP ZVAR) |
| Controls | Front LCD display; ComfoSense C, ComfoConnect LAN/PRO (app, KNX/Modbus) options; humidity boost |
| Part numbers | 471502019 (CAQ450-ST-GB) – one article for both handings |