Genuine HRV (Heat Recovery Ventilator). Remove the moist stale air from inside your home and bring clean dryair from outdoors (Not Roofspace!!!).Controls Condensation and creates a healthier home. A genuine HRV must have a Supply and Exhaust Fan and a Heat Exchanger. The Cleanaire HRV has been manufactured in NZ for over 26 years and we offer a full 10 year warranty on the Aluminium Heat Exchange Core.