How often should I clean my dryer vent?

Clean your dryer vent at least once a year. If you run the dryer daily, every 6 months. Failure to clean is the leading cause of dryer fires, responsible for 34% of the roughly 13,820 dryer-related home structure fires reported in U.S. homes each year. Most homeowners skip it; most dryer fires are preventable.

How do I know if my dryer vent is clogged?

The clearest sign: a full load that used to dry in 40 minutes now takes two cycles. The dryer is running longer to push air through a restricted duct.

Other signs worth checking:

• The outside of the dryer gets unusually hot during a cycle
• A burning smell while it runs
• The vent flap on the exterior of the house doesn’t open fully when the dryer is on
• Clothes come out hotter than normal but still damp

Any one of these is worth acting on before the next scheduled cleaning. Two or more means the vent is restricted now, not eventually.

How do I clean a dryer vent myself?

You need a dryer vent cleaning kit: a flexible rod with a lint brush that accepts extension sections. These run $15 to $30 at any hardware store. The Gardus LintEater is the most common; it attaches to a power drill, which speeds the job considerably.

Pull the dryer away from the wall and disconnect the duct from the exhaust port on the back. Run the brush from the dryer end toward the wall, pulling lint back out as you go. Then go outside, remove the vent cover, and run the brush from the exterior end if the run is accessible from that direction.

Reconnect the duct, push the dryer back, and run a short air-fluff cycle to clear any loosened lint. The whole job takes 20 to 30 minutes.

If the vent run is more than 15 feet or makes multiple 90-degree turns, a longer extension kit handles it. Runs over 25 feet are worth hiring out: a professional with a rotary brush system cleans them more thoroughly than a rod kit can reach.

Does duct material change how often I need to clean?

Yes. Flexible foil accordion duct (the crinkled silver hose connecting the dryer to the wall) traps lint in every corrugation. If your dryer uses it for the full run, clean every 6 months regardless of laundry frequency.

IRC Section M1502 requires the main dryer duct to be rigid smooth-wall metal: minimum 4-inch diameter, joints running in the direction of airflow. New construction won’t have the foil accordion for the full run. Older houses sometimes do. The right long-term fix is swapping it for rigid metal the next time you pull the dryer away for cleaning anyway.

A short flexible transition piece (up to 8 feet) between the dryer and the wall is permitted under M1502.4.2. That section still needs inspection at cleaning time and replacement if the foil shows kinks or holes.

Rigid smooth-wall metal needs cleaning once a year. It sheds lint more freely and has less surface area for buildup. A straight 6-foot run through an exterior wall is low risk; a 20-foot run with two elbows warrants the full annual attention.

What happens if I don’t clean it?

Lint is fuel. A clogged duct retains heat, lint builds up near the heating element, and the result is a fire that starts inside the wall where it’s hard to see and hard to stop. The NFPA attributes roughly $233 million in annual direct property damage to dryer fires, with failure to clean as the single leading cause.

Short of a fire, a clogged vent shortens the life of the dryer. The motor runs longer on every cycle to compensate for restricted airflow. InterNACHI’s component lifespan chart puts a clothes dryer at 13 years. Chronic restriction cuts that down, and raises the energy bill on the way. A new dryer runs $600 to $1,500 for a standard model. Annual vent cleaning costs $15 in a brush kit or $100 to $175 for a professional. The math isn’t close.

It’s the same dynamic as a clogged HVAC filter: a cheap annual task, skipped for years, becomes an expensive failure.

Should I hire someone to clean my dryer vent?

For most houses, no. The $15 brush kit handles it. Hire out when the duct run is over 25 feet, when it makes more than two elbows, or when the exterior vent is on the roof rather than a side wall.

A professional service uses a rotary brush and a vacuum at the exterior end simultaneously. They can also scope the run with a camera if you’ve never had it done and want to confirm the duct is intact. Cost is $100 to $175 for a standard visit.

One thing to watch: some HVAC cleaning companies upsell a full duct cleaning when you call about the dryer vent. The dryer vent is a separate system from the HVAC ducts. They’re not connected, and cleaning both in the same visit isn’t necessary unless the HVAC ducts are independently due.

A note from Kempt

Dryer vent cleaning is one of those annual tasks that falls off the radar until something goes wrong. Kempt puts the cleaning on your home’s calendar based on duct type and laundry frequency, and flags it earlier if the dryer starts logging longer-than-normal cycle times. The goal is catching the clog before the fire risk, not after.