Ventless dryers are also called "condensing dryers", because they condense and drain the moisture from the clothes (Figure 1). They also operate more efficiently and do not require access to an exhaust route. Because they pull in unconditioned air and pull conditioned air out of the home, they can also cause the heating, ventilation, and air-conditioning (HVAC) equipment to work harder.Įlectric ventless clothes dryers, on the other hand, operate without exhausting air out of the home or depressurizing the space. They could also potentially encourage conditions for backdrafting of atmospheric vented combustion appliances if there are any located in the home. Because they exhaust air outside, conventional electric or gas clothes dryers contribute to the depressurization of the home, which will pull unconditioned air into the home from locations such as the garage, attic, crawlspace, or outside. This process consumes and wastes a lot of energy, as is evident in the high temperature of the exhaust air. Conventional vented clothes dryers pull air from the room, heat this air, blow it into the tumble chamber of the clothes dryer, and then exhaust the moisture-laden air through a vent to the outside.
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