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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. 

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.

If you're dealing with an odor in your dryer that transfers onto your clothes and linens, here's what you can do: start by cleaning the lint trap and drum with warm soapy water. Then wipe down the interior using a mixture of equal parts water and white vinegar to eliminate any lingering odors.

To get rid of odors you can try this method: take a cloth soaked in vinegar and put it inside the dryer. Run the dryer on a heat setting for 15 minutes. Afterward, make sure to dry the drum by running it with some towels. This technique helps eliminate any smells and leaves your dryer smelling nice and fresh.

If the odors remain, you may need to sanitize your dryer or call in a professional house cleaner to handle the job.

Call 911 immediately. If you have a fire extinguisher or fire blanket near the laundry room, you can attempt to extinguish the fire, but don’t open or touch the dryer. If you can’t put the fire out, evacuate yourself, your family, and your pets from the house, closing the laundry room door behind you. Turn off the electricity to your home via the outside fuse box, then wait for the fire department. After a dryer fire, have your home’s electrical system inspected to make sure there isn’t any damage.