Are Indoor Dryer Vents Dangerous?

Indoor dryer vents expel moist air and lint into the home, which creates mold and fire hazards. Dryer vents should always be vented outside, according to the Centers for Disease Control and Prevention (CDC).

Mildew

Venting moist air into your home promotes the growth of mold. Mold damages your possessions and the structural integrity of your home. It may also cause eye irritation, respiratory symptoms and coughing. If you can smell a musty odor, your house contains mold.

Fire Risk

Lint that accumulates in or outside a dryer vent may prevent proper ventilation, which can cause overheating. Overheating may ignite the lint, your clothes or surrounding objects, causing a fire.

Dryer Safety

Clean your dryer vent twice a year with a vacuum cleaner to remove any dirt, dust or lint. Do not place screens over the dryer's outside vent, since lint can build up on the screen. Always stay home while using the dryer, and keep the surrounding area clear.

References

• U.S. Fire Administration: Clothes Dryer Fires in Residential Buildings
• CDC: Facts about Mold and Dampness
• Mass.gov: Prevent Dryer Fires