How Often to Clean Dryer Vents (and Why It Matters) (2026 Schedule)

Lint screen every load. Full vent ductwork once a year. This isn't optional — it's a fire hazard.

Schedule at a glance

Frequency	What to do
Every load	Empty the lint trap (a half-full screen reduces airflow 40%)
Every 6 months	Vacuum the lint trap housing with a long-hose attachment
Every 12 months	Clean the entire vent duct from the dryer to the exterior vent
Every 12 months	Inspect the exterior vent hood — it should open when the dryer runs and close when it's off
Every 5 years	Replace any flexible foil/vinyl ducting with rigid metal duct (foil is a fire hazard)

How to do it

Pull the dryer 1-2 feet away from the wall after unplugging it (or turning off the gas valve for gas dryers).
Disconnect the vent duct from the back of the dryer (usually held by a metal clamp).
Use a dryer vent cleaning brush kit (~$25, available at hardware stores) — looks like a chimney sweep brush.
Insert the brush into the duct on the dryer side and rotate while pushing through. Pull out all loosened lint.
Repeat from the exterior vent side. Have someone inside watch for clogs while you brush from outside.
Use a shop vac to suck out remaining loose lint from both ends.
Inspect the exterior vent flapper — it should swing freely. Replace if stuck or screened-over with a bird guard that's clogged.
Reattach the duct and clamp, push dryer back, restore power.

Signs you're overdue

Clothes take much longer than usual to dry (1+ cycles for a load that used to take 1)
The dryer or laundry room is unusually hot during a cycle
Burning smell during a cycle
Lint visible around the exterior vent or under the dryer
Dryer shuts off mid-cycle (overheat protection tripping)
Visible scorch marks behind the dryer

What it costs

DIY brush kit $20-$30. Professional cleaning $100-$200/year. Replacing flexible duct with rigid $50-$150 in materials.

FAQ

How often do clogged dryer vents cause house fires?

The U.S. Fire Administration attributes ~15,000 house fires per year to dryer lint — typically clogged vents that overheat the dryer. Most happen in homes where the vent was last cleaned 3+ years ago, or never.

Can I use a leaf blower to clean my dryer vent?

Some people do, but it's risky. The high-pressure air can damage the duct, blow lint into hidden cavities, and miss compacted clogs that a brush would catch. The $25 brush kit is faster and safer.

What's wrong with flexible foil dryer ducts?

They trap lint in their ridges far more than smooth rigid ducts, and the foil material can ignite under prolonged heat. Most building codes now require rigid metal duct (or rigid 'semi-rigid' aluminum) for new installations.

How long should a typical dryer vent be?

Maximum 25 feet straight (per IRC code). Subtract 5 feet for each 90-degree elbow. So a vent with two elbows can be at most 15 feet long. Longer runs require booster fans or dedicated outside venting.

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How Often to Clean Dryer Vents (and Why It Matters)