The Smartvent system lets you ventilate your house 24hrs a day. Smart-Vent encompasses 'heat recovery', utilising available warm air from the sunny side of your roof space. Smartvent passes the ventilation air through a high grade filter before being gently distributed around the home via two diffusers set in the ceiling at strategic points. This continuous circulation of fresh drier air creates a positive pressure in the home thus pushing the damp stale air out of the home