How ProAir HRV works

A Heat Recovery Ventilation System will provide a continuous supply of clean, fresh air throughout a house 24/7 (Ventilation) while at the same time recovering heat (Heat Recovery) that would otherwise be lost to the outside. ProAir’s HRV systems minimises heat losses and ensures a healthier more comfortable indoor climate. Air is extracted from the ‘wet’ rooms of the house such as the kitchen, utility and bathrooms. These rooms are the ones that will be most contaminated as a result of washing, cooking etc. This stale air travels through a system of ducts to the HRV unit. At the heart of the HRV unit is a heat exchanger. Here the heat from the extracted air is transferred to the incoming fresh air. The extracted air is expelled to the outside. The incoming fresh air which has been filtered to remove dust etc. travels through another system of ducts to the living rooms and bedrooms of the house. The result is that the fresh air supplied to living spaces will be pre-warmed to virtually the current temperature of your house.

Fig 1 We do this at ProAir, by utilising the latest in counter-flow heat exchange technology.



Each outgoing stale, moist and warm channel is surrounded by three cold, fresh and clean channels as in Fig 2. Likewise each duct with exhaust air is surrounded with three fresh air ducts. This maximises the surface area over which the heat can be transferred. In this way the outgoing air warms the incoming air as the two air streams pass through one another without mixing. As the two air-streams remain separate, no contamination of the incoming fresh air occurs. The ProAir heat exchanger is made up of hundreds of these hot and cold triangular ducts, resulting in a large surface heat exchange area and extremely high efficiency of 90%.