Written by the SWA Passive House Team
Common laundry rooms are typically provided in market rate and affordable multifamily buildings. Because there are no ventless clothes dryers available for commercial use in North America (such as condensing or heat pump dryers), Passive House (PH) projects must make do with standard coin-operated, conventional vented clothes dryers. With a conventional electric or gas vented dryer, ambient air from the laundry room is heated and blown into the dryer’s drum as it tumbles. This air picks up the moisture from the laundry and is exhausted – sending hot moist air and lint particles to the outside. For any dryer that exhausts more than 200 cfm and in common laundries that have several dryers, make-up air must be supplied to the room so the dryers have enough air to operate properly. This make-up air must then be heated or cooled and therefore, increases the building’s energy demand.