The Purge-Air-Lator home ventilation system from HRV Australia

Does your roof space get hot during summer and heat up your home? HRV Australia has developed an ingeniously simple device to work in conjunction with its award winning natural heating and cooling system. The ‘Purge-air-lator’ has undergone further refinement in preparation for this summer and the latest evolution means that you can automatically purge hot air from your roof space when the temperature becomes undesirable.

The roof cavity is ventilated by exhausting hot air and drawing cooler air, significantly reducing peak temperatures in the roof space during the day and cooling it faster at dusk. The result is a significant reduction in the super heating of ceiling insulation which then radiates down into your home during the day and evening.

Testing has shown that during summer, the roof can radiate heat all night long unless hot air is continuously exhausted out. The Purge-air-lator will continue to provide cooling benefits well after the sun has gone down and throughout the night enabling your family to sleep in a more comfortable environment. In conjunction with HRV, you wake up to cooler fresher home at the start of the next day, rather than a stuffy house, and it’s all done with freely available natural, fresh air. A cooler house at the start of the day reduces the core temperature of your home and reduces the need to use artificial cooling devices.

The major advantage of controlled ventilation of the roof cavity is that during summer, hot air is purged and during winter, the warm blanket of air is not evacuated, unlike uncontrolled ventilation which significantly increases household heating requirements.

HRV has a fundamental aim to reduce the unnecessary use of artificial heating and cooling by intelligently using warm or cool air which is freely available. To see how HRV uses naturally occurring warm or cool air to keep your household at a comfortable temperature