What is Dryer Lint? | TSE Glossary
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What is Dryer Lint?
Dryer lint is the cellulose-fiber residue shed from clothing during tumble drying, accumulating in lint screens, transition ducts, dryer vents, and termination hoods. Lint is highly flammable: it ignites at low temperatures and burns rapidly. The U.S. Fire Administration attributes more than 15,000 residential fires per year to dryer-vent ignition, with property losses exceeding $200 million annually. Lint accumulation is the underlying cause in nearly every case.
How it works
Lint sheds from fabric during the tumbling and heating cycle of drying, with the dryer’s exhaust fan pushing it through the lint screen and into the vent path. While the lint screen captures the bulk, fine fibers pass through and accumulate on the inside walls of the vent run. Over time, this buildup restricts airflow, causing the dryer to run longer and hotter to dry the same load. The combination of restricted airflow, high temperature, and accumulated combustible fiber creates ideal conditions for ignition.
Symptoms of lint buildup include longer dry times, clothes that come out damp, hot exterior dryer surfaces, and burning smells from the laundry area. The IRC and IRC M1502 require dryer vent runs to be cleaned at intervals matching usage, and high-volume households should clean annually at minimum. Sweeps and dryer-vent specialists use rotary brushes, compressed air, and inspection cameras to clear vents and verify integrity.
DFW context
DFW homes with second-floor laundry rooms or laundry rooms remote from exterior walls often have long, complex vent runs that accumulate lint faster than ground-floor short runs. Tract homes built since 2010 frequently have 30-foot or longer runs with multiple elbows, well above the IRC maximum equivalent length. TSE inspects vent runs for length compliance, replaces noncompliant flexible duct with rigid metal, and provides annual cleaning service for high-volume households.
Related terms
- [Transition duct](/glossary/transition-duct/)
- [Rigid metal duct](/glossary/rigid-metal-duct/)
- [Periscope vent](/glossary/periscope-vent/)
- [IRC M1502](/glossary/irc-m1502/)
Sources
- IRC 2021, Section M1502
- U.S. Fire Administration dryer fire statistics
- UL 2158A dryer exhaust duct standard
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