By allowing the vent opening to shut when the dryer is not in use, dryer vent covers prevent cold air from entering the home in winter or air-conditioned air from leaving home in summer months.
The average dryer dries clothes by sucking in air from the surrounding room into the dryer. This air is pass through a heating element that heats the air. That heated air is pulled or forced through a rotating "drum" that holds the wet clothes. An exhaust vent in the dryer forces this heated air, which turns to steam as it is drawn through the wet clothing, to pass out of the dryer.
The stream contains lint, small fibers of the fabric released from the clothing during the whole drying process. Some of this lint gets past the lint filter, especially if the filter isn't cleaned properly, and escapes into the dryer vent. It is either trapped on the sides of the dryer pipe, or on any screws or projecting surfaces or crevices or condensed moisture inside the pipe. You can also force it out the exterior opening of the pipe.
Dryer vents are a slatted or circular-shaped flap that covers the entire end of the exterior opening of a dryer vent. The flap opens when hot dryer air is vented out of the dryer and closes when the dryer shuts off. This closed vent then seals the opening to the vent securely when the dryer is not in use, preventing access for birds, hornets, or insects who may be tempted to nest inside the opening.
Because dryer vent covers only open when the dryer is in use, the movement of air, either air-conditioned to the outside, or cold air to the inside, is prevented with a vent cover. Dryer vent cover also keeps rain, snow, dust, or other debris from blowing into the dryer vent. Because outside air isn't allowed in and heated or cooled air isn't allowed to pass from interior, the dryer vent cover makes for more energy-efficient clothes drying.
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