How to clean your dryer vent (and prevent a house fire)

Every year, U.S. fire departments respond to an estimated 14,000 home fires involving clothes dryers. The leading cause? A simple failure to clean. Lint is highly flammable, and when it accumulates in your vent, it restricts airflow, causes your dryer to overheat, and creates a significant fire hazard.

Cleaning your dryer vent is a 15-minute maintenance task that can literally save your home. Beyond safety, a clear vent also means your clothes dry faster, saving you hundreds of dollars in energy costs annually.

🔦 The Flashlight Test: A 2-Minute Safety Check

Use this method to quickly verify if your duct is clear:

1. Unplug the dryer and pull it away from the wall.
2. Disconnect the transition duct from the wall opening.
3. Shine a bright flashlight into the wall duct.
4. Have a second person look at the exterior vent hood outside. If the run is short and straight, you should see light. If not, you have a significant obstruction.

Step-by-Step: How to Clean Your Dryer Vent

Part 1: Behind the Dryer (Inside)

1. Safety First: Unplug the power cord. If you have a gas dryer, turn the gas shutoff valve to the perpendicular (closed) position. 2. Disconnect the Duct: Loosen the clamps and remove the flexible duct from the back of the dryer and the wall. 3. Clean the Lint Trap Cavity (The Often-Missed Step): Reach down into the lint filter slot with a narrow flexible brush. This area is closest to the heating element and is a frequent fire starting point.

4. Vacuum the Port: Use a vacuum with a crevice tool to clear lint from the dryer's exhaust collar. 5. Brush the Wall Duct: Insert your vent brush into the wall duct. Rotate it while pushing forward, adding rods until you reach the end. Periodically pull it back to remove lint clumps.

Part 2: The Vent Cover (Outside)

1. Inspect the Flap: Go outside and locate the vent. Remove the cover if possible.

2. Clear Debris: Use your brush or vacuum to remove lint mats, bird nests, or debris from the opening. 3. Test Airflow: Reconnect everything inside and run the dryer on a 10-minute "Air Fluff" cycle. Go outside and verify strong, warm airflow is exiting the vent.

Common Mistakes to Avoid

• Using Plastic Ducts: Plastic or thin foil accordion ducts are a fire hazard. Use UL-listed semi-rigid or rigid metal ducts instead.
• Ignoring the Gas Line: Never pull a gas dryer out without checking the flexible gas line for kinks or stress.
• Mesh Screens: Do not use fine mesh screens on exterior vents; they trap lint instantly. Use louvered or flap-style covers.

How Often Should You Clean?

⚠️ When to call a pro: If your vent exits through the roof, do not attempt to DIY. The fall risk and specialized equipment required make this a professional-only job. Expect to pay between $130 and $200 for a professional cleaning.