How Often to Clean Your Dryer Vent

Clean your dryer vent at least once a year. This isn't optional maintenance... it's fire prevention. The U.S. Fire Administration reports that clothes dryers cause approximately 2,900 house fires every year, and the leading cause is failure to clean the vent. Lint is extremely flammable, and when it builds up in the vent duct, it restricts airflow and causes the dryer to overheat. That combination of fuel and heat is exactly how fires start. The lint trap catches about 75% of the lint your dryer produces. The other 25% goes into the vent duct. Over a year of regular use, that adds up to a significant blockage... especially in longer vent runs. If your dryer vent runs more than 15 feet from the dryer to the outside wall, or if it has multiple 90-degree turns, lint accumulates faster in those bends and you may need to clean it every 6 months. Beyond fire safety, a clogged vent costs you money. When the dryer can't exhaust hot, moist air efficiently, drying times increase by 30 to 50%. That means higher energy bills and more wear on the dryer. A dryer that should last 12 to 14 years might only last 8 if it's constantly overheating from restricted airflow. The heating element and thermal fuse take the brunt of it. You can clean the vent yourself with a $20 to $40 dryer vent cleaning kit that attaches to a drill. It takes about 30 minutes. For longer or more complex vent runs, a professional cleaning costs $100 to $170 and includes inspection of the vent for damage. While you're at it, check the exterior vent flap. It should open freely when the dryer runs and close completely when it stops. A stuck or missing flap lets birds, rodents, and cold air into the duct. One more thing... never use flexible plastic or foil vent ducts. They sag, trap lint, and are a fire hazard. The only acceptable duct material is rigid or semi-rigid aluminum.