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Yes, mold can grow in a wet dryer vent. Mold is a type of fungi, and fungi thrive in warm, moist conditions. Dryer vents need to be aired out so heat can escape and moisture can dry. If your dryer vents aren’t properly vented, the trapped heat and moisture will cause mold to grow, and the mold can spread to the dryer and even your clothes. Not only can this leave a musty smell on your freshly laundered clothes, but—more importantly—it also poses a health risk.

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.

Dryer vents commonly need to be replaced every one to three years. This will depend on the rate at which you dry loads, how often you clean your vent, and what type of vent you have. For instance, regular care will prolong the life span of most options, while aluminum foil vents may need to be replaced more frequently with or without regular maintenance.

If you happen to disassemble your dryer vent and feel the inside of the duct immediately after drying a load of laundry, it will likely feel damp and warm. That’s normal, as the vent has just finished moving the humidity and moisture from your laundry to the exterior of your property. However, if your dryer vent has water droplets in it at any time, it’s a sign that there’s trouble with the machine’s ventilation. You should call in a professional right away to get the issue fixed.