Dryer Vent Cleaning FAQ

Typical national ranges put dryer vent cleaning at about $104–$188, with HomeAdvisor's average around $145 and a full range of $75–$340. First-floor vents usually run $80–$175, second-floor vents $110–$200 and roof vents $150–$300. These are estimates, not quotes. See the cost guide for add-ons and a calculator.

Dryer vent cleaning addresses a real, documented problem. The USFA (2008–2010 data) found failure to clean was the leading factor in residential clothes dryer fires, at 34 percent, and NFPA (2014–2018) put failure to clean at 32 percent of home dryer fires. To avoid overpaying, get a written quote that lists exactly what's included.

Usually not in depth. A vent cleaning focuses on the duct from the back of the dryer to the outside, plus the transition duct and exterior cap. Some technicians vacuum the lint trap housing while the dryer is pulled out, but cleaning inside the cabinet is a separate service. Ask what's included when you get your quote.

NFPA and GE say at least once a year. Some manufacturers, including Whirlpool and Maytag, say every one to two years. Long runs, roof or second-floor vents, large households and homes with pets tend to clog faster. If drying times creep up or clothes come out damp, clean sooner rather than waiting for the calendar.

The CPSC says clothes still damp after a typical cycle, or drying that takes longer than normal, may mean the lint screen or exhaust duct is blocked. Other signs include weak airflow at the outside hood, a flap that won't open, lint around the exterior vent, a very hot laundry room, or a "Check Vent" alert. See all the signs.

Yes. The International Residential Code, which Alabama has adopted with amendments, limits the exhaust duct to 35 feet from the transition duct connection to the outlet, reduced for fittings, unless the dryer manufacturer's instructions allow otherwise. The 2021 IRC prohibits domestic booster fans; only UL 705 listed power ventilators are allowed. Read the 35-foot rule explained.

Straighter is better, but bends are allowed. Each fitting reduces the 35-foot maximum length under the IRC's equivalent-length table. For example, a 90-degree elbow with a 4-inch-radius miter counts as 5 feet, while a smooth 6-inch-radius 90 counts as 1 foot 9 inches. Fewer and gentler bends mean better airflow and less lint buildup.

Residential dryer vents are 4 inches. The IRC says the exhaust duct shall be 4 inches nominal in diameter, with a smooth interior, made of metal at least No. 28 gage. The flexible transition duct behind the dryer must be a single UL 2158A listed length, no more than 8 feet long and not concealed within walls or ceilings.

Yes, roof terminations are common, especially for second-floor laundry rooms. The IRC requires the exhaust to terminate outside the building, generally at least 3 feet from openings into the building unless the manufacturer says otherwise, with a backdraft damper and no screen. For a new vent route through a wall or the roof, check with your city's permit office.

Not under the code. The International Residential Code says dryer exhaust ducts shall terminate on the outside of the building. Venting into a garage, attic or crawlspace dumps hot, moist, lint-filled air indoors instead of outside. If your dryer currently vents indoors, ask for a quote on a proper vent reroute.

No. The IRC requires the dryer exhaust to be an independent system, separate from bathroom fans, range hoods and other exhaust. Tying a dryer into another duct spreads lint into places that aren't built to handle it and can push exhaust back into the house. A dryer vent should run on its own to its own outside termination.

Look for a company that specializes in dryer vents or lists them as a core service; some HVAC companies and chimney sweeps also do them. We connect Birmingham-area homeowners with independent local dryer vent cleaning companies for free, no-obligation quotes. Ask any company for its city business license, proof of liability insurance and a written quote.

Under Alabama's Home Builders Licensure Board law, a license applies to residential repair or improvement jobs over $10,000, or over $2,500 for residential roofing. Typical dryer vent jobs cost far less. If a company also offers HVAC air duct cleaning, ask about its HACR certification, which Alabama's HVAC board requires. This is general information, not legal advice.