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Tools & Tips

Determining your ventilation needs

How much fresh air do I need

Good air quality is based on the capacity of the home's ventilation system.

Usually, the HRV's or ERV's capacity is measured in CFM (Cubic feet per minute) or L/s (Liters per second) of fresh air being distributed in the living space.

The Room Count Calculation or the Air Change per Hour Method shows you how to determine your ventilation needs. 

Download the Room Count Calculation & Air Change per Hour Methods (pdf)



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HRV (Heat Recovery Ventilator)

If you use a heating system more often than air conditioning, you need an HRV. 
Heat recovery systems have been designed to recover the heat contained in exhaust air.

ERV (Energy Recovery Ventilator)

If you use the air conditioning more than a heating system, an ERV is recommended.
Energy recovery systems have been designed to recover the energy contained in exhaust air. 

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How much fresh air do I need: Determining your ventilation needs
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