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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.

You’ll find the backdraft damper near the top of the range hood (where it connects to the ductwork). However, some range hoods also have a second damper, which is located close to the roof or exterior wall where the ductwork ends. If you don’t see a damper in either of these places, you might not have one.

Signs that your dryer is about to catch fire include a burning smell or the dryer and the clothes getting hotter than usual. If this happens, turn the dryer off immediately and call a repair professional. Another less urgent sign is that your clothes are taking longer to dry than normal. If this is the case, check the lint trap, vent, and duct to make sure they are all clean. If they are, you may need to call a pro to find the source of the issue.

Yes, dryer vent cleaning is absolutely worth the money. The service is relatively inexpensive and quick, and the value and peace of mind you get for the investment make it worthwhile. A clogged dryer vent is a significant fire risk, so the average $140 you might pay to have your dryer vent cleaned once a year could save you thousands of dollars in home repairs if the clog causes a fire. Additionally, some homeowner’s insurance companies will charge you a lower premium if you provide receipts of annual dryer vent cleanings by a professional.