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In a ventless dryer, lint it collected in a lint filter found inside the door or dryer drum. Vented dryers have this same lint filter, but in a ventless dryer you’ll need to stay on top of cleaning the lint filter after every wash. This is a common best practice, regardless of your dryer vent type.

Depending on how much you use it, your dryer should be disinfected about every six to 12 months, especially if you see frequent buildup of lint or evidence of stains from fabric bleeding or ink. 

Other signs you should sanitize your dryer more often are overheating, improper drying, excessive humidity, or if you notice a strange odor when it’s running.

The length of an allowable dryer vent varies based on the local building codes and regulations. Typically, the maximum range is 25 to 35 feet. However, if the vent must have any 90-degree turns, you may see a reduction of five feet from the maximum. Some municipalities may have no specific maximum allowable length as part of the code. Typically, installers will run the vent over the shortest possible distance for safety. The dryer vent cleaning cost is less with a shorter vent length as well. 

Dryers pull in air from a circular opening in the back of the dryer. The dryer's heating element heats the air, and a blower fan circulates the hot air through the drum. The hot air travels outside the dryer through a vent or is cooled by a heat exchanger that condenses the steam into water and sends it down a drainpipe or to a containment compartment.