When you construct an airtight building, you need to provide ventilation. We use a Heat Recovery Ventilation (HRV) System. The HRV system enables the exchange of fresh, filtered air, removing dust, allergens, smoke from distant wildfires and other particles as well as moisture. All the air you breathe comes from a known source and has passed through a fine filter. In addition, the ventilation system has a special feature that captures most of the heat in the outgoing air and returns it with the incoming air.
In a conventional leaky building, air enters the building wherever it can find its way in rather than coming in through a filtered system. Because hot air rises and exits the building through the top, the incoming air you breathe often comes from the crawlspace and can carry dust, allergens and toxins it picks up on the way in.