Crystal Air Duct Solutions blog

Dryer Vent Fire Safety: Signs, Causes and Prevention

Why lint builds up in dryer vents and how to keep your laundry room safe.

Short answer

Dryer vent fires start when lint builds up in the vent line and the dryer overheats. Warning signs include loads that need two cycles, a hot dryer or laundry room, a burning smell and weak airflow at the outside vent. A yearly dryer vent cleaning is the best prevention.

Published 2026-10-12 · By the Crystal Air Duct Solutions team

Why lint builds up

The lint screen catches only part of the lint. The rest travels into the vent line and collects at bends, joints and the outside cap. Long runs, rooftop vents and foil hoses make it worse.

Warning signs

Clothes still damp after a full cycle
Dryer or laundry room feels hot
Burning smell while drying
Lint around the outside vent flap
Weak or no airflow at the outside vent

How to prevent it

Clean the lint screen every load, keep the area behind the dryer clear, replace foil or plastic hoses with metal duct, and have the full vent line cleaned once a year.

Written by the team at Crystal Air Duct Solutions, an owner-operated duct and dryer vent company in Malibu, CA. Our owner has more than 20 years of experience.