Like all Passive Houses, ours has a balanced ventilation system (same amount of supply and exhaust) that runs continuously. It has an extremely efficient fan, and recaptures about 85% of the outgoing heat, so it is a low-energy way of providing great indoor quality. The system extracts air from the kitchen, bathrooms, laundry, basically any place that makes moisture and odors, and supplies fresh air to bedrooms and other living spaces. Imagine getting fresh air continuously as you sleep...you wake more refreshed, having been breathing air that was cleaned of pollen and molds by the (MERV 7/8) filter.
|Zehnder, beginning of installation|
Our system is a Zehnder ComfoAir 550. Zehnder not only has great heat recovery technology, but they have also developed a suite of products that make sizing, installation, and commissioning (getting air flow right) a breeze. The small flexible ducts clip into supply and exhaust manifolds, and into supply and return diffusers, which have fittings to adjust flow rates.
|Zehnder with ductwork connected to supply and exhaust manifolds|