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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.

Condensation in your dryer can create a dangerous situation. It can cause lint to clog up the venting components of the system. If you have a gas-powered dryer, excessive lint buildup can create the potential for carbon dioxide buildup within your home. Clogged vent systems can also be a severe fire hazard. 

A dryer vent inspection is simply the process of checking the vent for the possibility of damage or clogs. You can do it yourself or hire a pro. Pull the dryer away from the wall and inspect the portion of the vent that’s behind the appliance for lint buildup or kinks. Check the connection of the vent to the wall for loose parts or lint that’s escaping the vent. Check the exterior exhaust vent for signs of damage or lint blockage. A pro can check the length of the vent inside the wall for you. 

At a minimum, you should clean your dryer vent at least once a year. You may need to clean the dryer vent more often, such as every six months, if your dryer sees frequent or daily use. If you have young children or pets, you may need to clean the vent quarterly. 

There are a few signs that tell you it's time to clean your vent. If your clothes are very hot when they come out of the dryer or it's taking longer than usual for clothes to dry, the vents need cleaning.