Cleaning Out the Dryer Vent — Step-by-Step Guide (2026)

Before cleaning the vent, unplug the dryer from the electrical outlet. If you have a gas dryer, locate the gas shutoff valve (typically behind the dryer or in a nearby cabinet) and turn it to the off position. Move the dryer at least 2 to 3 feet from the wall — most dryers sit on casters or slide easily on smooth floors. Take a photo of the duct connections before disconnecting anything so you can reassemble correctly. Gather your tools: a dryer vent cleaning brush kit ($25–$50) with flexible rods and a round brush, a cordless or corded drill, a shop vacuum, a flashlight, and foil HVAC tape for resealing connections.

The transition duct is the short flexible hose (usually 4 to 6 feet) that connects the dryer's exhaust port to the duct inlet in the wall. Loosen the hose clamp at both ends with a screwdriver and slide the duct off. Inspect it carefully: if it is made of white plastic or vinyl, replace it before reassembly — plastic flex duct is prohibited by most building codes because it is flammable. Semi-rigid aluminum or rigid metal duct is the correct material. Also check for kinks, tears, or crushed sections that would restrict airflow. A damaged transition duct should be replaced ($10–$20 at any hardware store).

With the transition duct removed, vacuum directly inside the dryer's exhaust port (the round opening on the back of the dryer). You will likely find a substantial lint buildup here. Also vacuum the duct inlet on the wall — the opening where the transition duct connected. Use a crevice attachment to reach inside both openings. A flashlight helps you see how far the buildup extends. At this point, also use a long flexible lint brush to clean the inside of the lint trap cavity (the slot the lint screen slides into) — pull the screen out and insert the brush to dislodge any lint packed below the screen.

Assemble the first section of the flexible rod by threading the round brush onto the rod tip. Insert the brush into the wall duct opening and push it as far as it will go before attaching additional rod sections end-to-end as needed. Once the brush is at maximum reach, attach your drill to the back end of the rods. Run the drill at low to medium speed, spinning clockwise, while pushing and pulling the brush through the duct. The spinning action dislodges lint that clings to the duct walls. Slowly pull the assembly back toward you while continuing to spin — the brush will drag lint toward you. Run the vacuum at the opening to capture dislodged lint as you pull out.

Go to the exterior of your home and locate the vent cap. It should be a plastic or metal louvered or flap-style cover, typically 4 inches in diameter, mounted flush with the wall or at the roofline. Remove any visible lint, dust, or debris around the vent opening. Check that the flap(s) move freely — they should hang closed when the dryer is off and swing fully open when air flows through. If you find bird or pest nests, clean them out carefully. If the nest material is compacted deep into the duct, this may require professional cleaning with a longer brush system.

Slide the transition duct back onto the dryer exhaust port and the wall duct inlet. Secure both connections with hose clamps and seal any gaps with foil HVAC tape (never use standard duct tape — it dries out and fails). Push the dryer back to its operating position, leaving at least 3 to 4 inches of clearance from the wall to prevent kinking the transition duct. Plug in the dryer (and restore the gas supply if applicable). Run the dryer on the highest heat setting for 10 minutes. Go outside and check the exterior vent — the flap should open fully and you should feel strong, warm airflow. Minimal or no airflow indicates the duct is still blocked and may require professional service.

Call a professional if your test cycle still shows weak airflow after cleaning, if you found a compacted clog you could not clear with the brush kit, if the vent exits through the roof (roof-access cleaning requires safety equipment and experience), or if you found damaged, kinked, or improper duct materials behind the wall. Professionals use commercial-grade rotary systems that can navigate multiple bends and reach ducts up to 35 feet long. Professional dryer vent cleaning costs $80–$180 for standard setups and $150–$335 for roof-exit or complex configurations (Angi, 2026 data).