Greenwood | Low Energy Bathroom Fan, Heat Recovery System, Whole House Ventilation


Heat Recovery for whole house ventilation
Zehnder ComfoSystems Passive Haus accredited product suitable for large houses up to 300m2. Designed to ensure low noise, excellent energy performance and heat exchange efficiency. Choice of control options including LCD touch screen display. Can be combine with ComfoCool for optional cooling of up to 5 degrees and humidity reduction by 20%
Features & Benefits
Models & Control Options
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Features and Benefits


  • A highly efficient Zehnder Comfosystems Heat Recovery System
  • EST Best Practise Performance with SFP as low as 0.8W/l/s and 93% efficiency
  • Ultra efficient EC motors for low running costs
  • Integral filtered summer by-pass
  • Grade GU4 Filters
  • PassiveHaus accredited

  • SAP Reward: Outstanding Energy Performance
    With a Specific Fan Power as low as 0.69 W/l/s and heat exchange efficiency as high as 88%, the CA550 Heat Recovery unit easily achieves EST Best Practise Performance and offers specifiers and designers excellent reward in SAP through the Dwelling Emission calculation.

  • Geothermal Heating and Cooling
    To maximise the comfort of the indoor environment, ComfoAir 550 can be installed in conjunction with ComfoFond, a ground source heat exchanger system that uses renewable energy sources to temper or cool supply air to the home. By utilising the constant temperature of the earth at the depth of about 1.5m, heating or cooling can be further provided to entire house, further benefiting the homeowner and the environment. 


  • PassiveHaus Accredited
    The CA550 LUXEPH model offers excellent energy performance and has been independently certified by the PassiveHaus Trust to be PassiveHaus accredited making it suitable for a wide range of highly insulated new build developments. With such a high certification, the ComfoAir 350 (CA350) has been widely specified for new build houses and apartments.


  • Summer By-pass and high grade filtration
    The CA550 has been designed with a filtered summer by-pass which ensures that overheating in the property in warmer summer months is eliminated. By by-passing the heat recovery mode, ventilation is continuously provided without warm and humid air entering the property unnecessarily. In addition to summer by-pass, the unit is also provided with grade GU4 filters as standard. Filtration of incoming air is crucial to ensuring a good level of indoor air quality at all times for occupants and especially essential in highly insulated dwellings where Heat Recovery is installed. Once the summer by-pass is activated, the fresh incoming air continues to be filtered (unlike a high number of other units)


  • Bend it - Shape it - Any way you want it: Ducting
    ComfoTube Semi Rigid Ducting is a revolutionary development in ducting for residential ventilation installations. Perfect for whole house heat recovery, ComfoTube is supplied on long rolls and can minimise connections by up to 75%! Designed with a strong and crush resistant construction, ComfoTube is a radial ducting system which dramatically reduces any issues with noise and air leakage as each room is provided with an individual run, ensuring specified ventilation rates can be met easily. No sealants or tapes are required with ComfoTube installations - Winner of Housebuilder Products Brand new Product of the Year 2013.

  • Luxury Model
    The CA550 Luxe PH model offers additional control options for the homeowner including radio frequency connectivity for additional switches which may be required around the property - removing the need to hardwire all switches. In addition, the luxury model which is available in right or left handed configuration has a built in pre-heater and is the PassiveHaus accredited option.
  • Cooling NOT Air Conditioning
    The CA550 can be installed with a ComoCool unit which is designed to prevent over-heating in new properties with Heat Recovery installed withouth having to opt for energy sappinig air conditioning units. The ComfoCool units work in conjunction with the Heat Recovery Unit and can reduce the internal temperature by 3-4 degrees. This ensures a comfortable enrivonment all year round as well as reducing the impact air conditioning has in SAP!

  • Optional Extras - Bringing the moisture back in...
    Sometimes in highly insulated and efficient homes, the air throughout the property can become dry and the level of indoor air quality can be impacted. When this is the case, the CA550 can be installed with our enthalpy heat exchanger cube which effectively reintroduces a level or moisture - or humidity recovery -back into the home to ensure the delivery of a comfortable indoor environment all the year round.


Models & Control Options



These are the typical anciallaries required for the installation of CA550 in an apartment or house - to view ancillaries in more detail, please click here

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