Passivent has launched the iHybrid domestic ventilation system, which it claims uses 55% less electrical energy than a conventional mechanical system

The system combines the benefits of natural “intelligent” passive ventilation with those of heat recovery in a “mixed mode” hybrid solution. 

Passivent iHybrid predominantly uses natural “passive stack” ventilation, harnessing natural air movement principles to draw fresh air in and exhaust stale air without electrical consumption, with “as and when necessary” heat recovery.

A thermostat monitors the outside temperature: when above 9°C, the natural ventilation wall vent remains open, with ceiling-mounted extracts drawing the internal air out. When the external temperature falls below 9°C, the system closes the wall vent and switches air transfer via the heat exchanger, transmitting warmth from the exhaust air to the incoming air.