Home maintenance guide

How often to clean a dryer vent

Updated 9 November 2026 · 6 minute read

Your dryer has two lint problems, and only one of them is obvious. The screen you pull out after each load catches most of the fluff. The rest gets blown down a duct, through a wall, and out a flap on the side of your house. That duct is the part people forget, often for years, because nothing tells you it’s filling up until the dryer starts acting strange.

Two different jobs: the lint screen and the vent

When people say “clean the dryer vent” they can mean either one. They aren’t the same job.

Why wash the screen? Dryer sheets and fabric softener can leave a thin film on the mesh. Run some water over it. If the water sits on top instead of passing through, the mesh is clogged even when it looks clean.

When once a year isn’t enough

Once a year is a common baseline, not a rule. Clean the duct more often if:

• You do a lot of laundry. A big household running the dryer every day fills a duct faster than a couple doing a few loads a week.
• You have pets. Pet hair adds a lot to what ends up in the duct.
• The duct is long or has several bends. Lint settles at every turn. A duct that runs across a basement or up through the roof clogs faster than a short straight one.
• You dry a lot of towels, bedding or new fabrics. These shed more lint than everyday clothes.

If you just moved in, you probably don’t know when the vent was last cleaned. Treat it as due now, then start the clock from there.

Signs your dryer vent is clogged

Any one of these is worth checking. Two or more together usually means the duct needs cleaning.

• Loads take longer to dry. A normal load needing a second cycle is the most common sign.
• The laundry room gets hot or humid while the dryer runs.
• The dryer or clothes feel very hot at the end of a cycle.
• A burning smell. Stop the dryer and check the screen and duct before using it again.
• The outside flap doesn’t open. Go outside while the dryer runs. You should feel a strong stream of warm air and see the flap lift. A weak puff or a flap that stays shut points to a blockage.
• Lint around the outside vent, on the wall or the ground below it.

Some newer dryers also show a vent or airflow warning. If yours does, your manual will explain what it means.

Why it matters

Lint burns easily, and a blocked duct traps heat near it. The U.S. Fire Administration lists failure to clean the dryer as a leading cause of home dryer fires. That isn’t a reason to panic. It’s a reason to put a once-a-year job on the calendar.

There are smaller costs too. A clogged vent makes the dryer run longer, which uses more energy and puts more wear on parts like the heating element. With a gas dryer, the vent also carries combustion exhaust outside, so a good airflow matters for that as well. Make sure you have a working carbon monoxide alarm, and if you ever smell gas, leave the house and call your gas company from outside.

DIY or call a pro?

Plenty of homeowners clean their own vent. It makes sense when the duct is short and you can reach both ends. A basic routine with a dryer vent brush kit looks like this:

1. Unplug the dryer. For a gas dryer, see the note below before moving it.
2. Pull the dryer out from the wall and loosen the clamp holding the duct.
3. Pull lint out of the duct and the dryer’s outlet by hand or with a vacuum.
4. Feed the brush through the duct toward the outside, a section at a time.
5. Go outside, clear the flap and pull out any lint you pushed through.
6. Reconnect the duct, push the dryer back without crushing it, and run a short cycle to check the outside flap opens.

Call a dryer vent cleaning service or an appliance pro if:

• The duct is long, runs through an attic, or exits through the roof.
• You can’t reach part of the duct, or it’s hidden inside a wall.
• The duct is crushed, torn or disconnected somewhere you can’t see.
• You find a bird nest or something else stuck in the outside vent.
• You have a gas dryer and aren’t confident moving it. Bumping or twisting the gas connector is not something to guess at. A pro can move it and check the connection.

Foil or vinyl duct? Consider replacing it

Look behind your dryer. If the duct is white vinyl or thin, crinkly foil, it’s worth replacing. These ducts sag, crush easily when the dryer is pushed back, and trap lint in their ridges. Many dryer makers and building codes call for rigid or semi-rigid metal duct instead. Your dryer’s installation instructions will say which kinds are allowed.

A few habits help whatever duct you have:

• Keep the run as short and straight as you can.
• Use foil tape or clamps at joints, not screws, which poke into the duct and catch lint.
• Leave enough space behind the dryer that the duct doesn’t kink.
• Make sure the outside vent has a flap, not a screen. Screens catch lint and clog.

A simple routine

Clean the screen every load. Look at the outside flap with the dryer running every few months. Clean the full duct once a year, or sooner if you spot any of the signs above. The hard part isn’t the cleaning. It’s remembering when you last did it, since a year is long enough to forget completely.

Questions about dryer vents