How do I know if my dryer vent needs cleaning?

The clearest signs are clothes taking longer than one cycle to dry, the dryer or clothes feeling hotter than usual, a burning smell, the outside vent flap not opening fully or with weak airflow, and more lint than normal appearing on the lint screen or around the door. A cycle that used to take 40 minutes now needing two runs is the classic tell. Any of these means restricted airflow, which both wastes energy and raises fire risk, so clean the vent when you notice them regardless of the calendar.

Is a clogged dryer vent really a fire hazard?

Yes. Lint is highly flammable, and a restricted vent traps heat in the dryer. US fire authorities including the CPSC and the National Fire Protection Association identify failure to clean as the leading factor in home clothes-dryer fires, and the U.S. Fire Administration attributes thousands of dryer fires a year, with clothes dryers involved in an estimated 2,900 home fires annually. The great majority of those are preventable with regular lint-screen and vent cleaning, which is why the once-a-year minimum is a safety recommendation, not just a performance one.

How often should you clean the lint screen versus the vent?

Clean the lint screen every single load — that is the front-line defense and takes seconds. The vent duct behind the dryer is separate and needs cleaning far less often: at least once a year for a typical household, more with heavy use or a long duct run. They are two different tasks. Wiping the screen every load reduces how fast the duct clogs, but it does not replace duct cleaning, because fine lint still escapes the screen and accumulates in the ductwork over time.

Does the length of the dryer duct matter?

A great deal. A short, straight duct to an exterior wall clogs slowly and needs cleaning about once a year. A long duct, or one with several elbows and bends, or a run up through a roof, traps lint at every turn and restricts airflow, so it needs cleaning more often — sometimes twice a year. Flexible foil or plastic transition hose collects lint faster than smooth rigid metal duct and is discouraged for the concealed run. The longer and twistier the path, the more frequently you should check it.

Can you clean a dryer vent yourself?

For most homes, yes. A dryer vent cleaning brush kit with flexible rods attaches to a drill and pushes through the duct to sweep lint out; you disconnect the duct from the dryer, brush from both ends, and vacuum up the debris. It is a straightforward hour-long job for an accessible, ground-level vent. Consider a professional for a long duct, a rooftop termination, or a run you cannot reach safely. Whichever route, also vacuum behind and under the dryer, where loose lint collects.

How Often Should You Clean a Dryer Vent?

Written & researched by Derek Holt Home & Appliances Editor

Updated October 2026

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Clean your dryer vent duct at least once a year, and more often — up to twice a year — if you do heavy laundry, have a long or bendy duct, or notice clothes drying slowly. This is separate from cleaning the lint screen, which you should do every load. The reason is safety as much as performance: lint is highly flammable, and a clogged vent traps heat, which is why US fire authorities identify failure to clean as the leading cause of home dryer fires. Slow drying, a hot dryer, or a burning smell mean clean it now, regardless of the date.

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How often, based on your setup?

The once-a-year minimum is a baseline; your real interval depends on how much you dry and how the duct runs. Use this guide, and clean sooner any time the warning signs appear:

Situation	Clean the vent duct
Average household, short straight duct	Once a year
Heavy laundry (large family, pets)	Every 6 months
Long duct or several bends / roof run	Every 6 months
Lint screen (every load)	Every load

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Why is this a safety issue, not just efficiency?

Because trapped lint plus trapped heat is how dryer fires start. The Consumer Product Safety Commission (CPSC) and the National Fire Protection Association point to failure to clean as the leading contributing factor in home clothes-dryer fires, and the U.S. Fire Administration ties clothes dryers to roughly 2,900 home fires a year. Lint ignites easily, and a restricted vent means the dryer runs hotter for longer to finish a load. The reassuring part is that these fires are overwhelmingly preventable: cleaning the lint screen every load and the duct at least yearly removes the fuel and restores the airflow that carries heat away.

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What are the warning signs between cleanings?

Your dryer tells you when the vent is clogging if you know what to watch. The most reliable sign is drying time: a load that used to finish in one cycle now needing two means airflow is restricted. Others include the dryer top or the clothes coming out unusually hot, a musty or burning smell, the exterior vent flap not opening fully, weak airflow at the outside vent, and extra lint collecting around the door or screen. Treat any of these as a signal to clean now — they mean the duct is choked whether or not a year has passed.

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How do you clean it yourself?

For an accessible vent, a lint-brush kit with flexible rods that chuck into a drill does the job in about an hour. Unplug the dryer, pull it out, disconnect the duct, and run the brush through from both the dryer end and the exterior end, then vacuum the loosened lint. Don't forget the space behind and under the dryer, where loose lint piles up. Smooth rigid metal duct clogs more slowly than flexible foil transition hose. Call a professional for a long duct, a rooftop vent, or any run you cannot reach safely. A shop vacuum with a HEPA filter contains the fine dust; see our cleaning and laundry guides for related gear.

A clean dryer vent pairs with a clean washer — see how often to clean a washing machine and why a front-load washer smells musty. For laundry results, what temperature to wash towels at and our best laundry detergent roundup help. More in the cleaning and laundry hub.