Airfi

The Airfi range of units features the innovative Airfi Frost Pro System (AFPS), setting it apart from other MVHR units that lack built-in frost protection. This feature is crucial for ensuring consistent ventilation, especially in colder months. When outdoor temperatures dip below freezing, bringing in cold air can cause ice to form inside the unit, potentially damaging the heat exchanger and other components.

Traditional frost protection systems use a small pre-heater to warm incoming air, keeping it above freezing. In contrast, the AFPS takes a more advanced approach by defrosting the heat exchanger only when necessary. This allows Airfi units to maximise efficiency without relying on a fixed temperature threshold. Since the heat exchanger is made of aluminium, some freezing is permissible, and defrosting occurs by diverting a small amount of incoming air around the heat exchanger. The heat from the units extract air then defrosts the exchanger, maintaining efficiency.

Although this process slightly cools the supply air, a small heater on the supply duct compensates, ensuring the air returns to the desired temperature. This temperature can be set lower to allow the space heating system, which can be more efficient (like an Air Source Heat Pump with a COP of 4), rather than an energy-draining electrical heater to keep the house warm.