Flow2One

Some house holders may tape up ventilation grills as they don’t like to “feel the cold” especially as they are perceive this wastes energy they are paying for.
This can have a very negative effect on the air quality in their dwelling, and the relative humidity levels, which may ultimately lead to mold growth.
Sacrificing the ability to exchange stale internal air with incoming fresh air can allow the build-up of carbon dioxide, and also moisture in the room, especially whilst occupied.

The ThermaVent “Flow2One” Single Room Heat Recovery Ventilator brings fresh air into living rooms or bedrooms, via fans pushing and pulling air through a 100mm (4”) diameter duct, either 240mm or 330mm long, mounted through an external wall. The same tube dimension as a traditional axial wall mounted fan.

The Flow2One pre-warms the fresh incoming air by way of a plate heat exchanger, an almost energy free solution.

Unlike most traditional axial wall or window glass mounted fans, which tend to use inefficient AC motors, the Flow2One incorporates two fans with DC motors. The unit only uses a total 1.9W and 2.7W of power, so costs less than 1 pence of electricity per 24 hours when in continuous use, based on current energy tariffs in the UK.

The % energy efficiency of the warming feature (free energy), to raise the incoming fresh air as close to the internal room air temperature as possible, is dependent on the time the exhaust air and the incoming fresh air flow across the heat exchanger plate surface. This is influenced by the rate of airflow and how thick your walls are (how long the duct and the heat exchanger are). So, regardless of the claimed maximum efficiency % figures by our competitors, the actual efficiency % varies accordingly. On “normal” walls thicknesses of 240mm (standard solid wall) or 330mm (standard cavity wall) the Flow2One would raise an external incoming fresh air temp from say 10oC to approx. 15 oC if the internal room temperature (exiting stale air) is 20oC.
This means 50% efficiency in a realistic normally constructed dwelling.
Unless the dwellings have air conditioning the heat exchanger will not cool incoming fresh air if it is warmer outside than inside (hot summer days). However, it will function with the same efficiency % (cool the incoming warm air) in dwellings with functioning air conditioning.

A remote control is supplied with each Flow2One to switch the unit on/off, and between low or high speed.