5 Warning Signs Your Dryer Vent Is Clogged

According to the U.S. Fire Administration, over 2,900 dryer fires occur in residential buildings every year, causing an estimated 5 deaths, 100 injuries, and $35 million in property damage. The leading cause? Lint buildup in dryer vents.

The warning signs are easy to spot — if you know what to look for. Here are the five signs your dryer vent needs immediate attention.

1. Clothes Take Longer Than One Cycle to Dry

This is the most common and earliest warning sign. If your dryer suddenly needs two cycles to get towels or jeans fully dry, the vent is likely partially blocked. A restricted vent traps moisture inside the drum, forcing the dryer to work harder and longer.

2. The Dryer or Laundry Room Gets Excessively Hot

When a dryer vent is clogged, hot air can't escape. The dryer itself will feel unusually hot to the touch, and the laundry room may become warmer than normal during a cycle. This trapped heat is exactly what makes lint a fire hazard.

3. A Burning Smell During Operation

If you notice a burning or smoky odor when the dryer is running, stop using it immediately. This smell often comes from lint that has become so hot it's beginning to smolder inside the vent line. Turn off the dryer, unplug it, and have the vent inspected.

4. The Exterior Vent Hood Doesn't Open

Go outside and check the vent hood on the exterior of your home while the dryer is running. The flaps should be fully open, with a strong flow of air coming out. If they're barely moving, stuck closed, or there's no airflow, you have a blockage.

5. Large Amounts of Lint Around the Lint Filter

While some lint on the filter is normal, if you're pulling out thick layers of lint after every single load, the vent line itself is likely packed with debris that the filter can't catch. This is especially common in homes where the dryer vent run is long or has multiple bends.

How Often Should Dryer Vents Be Cleaned?

We recommend professional dryer vent cleaning at least once a year for most households. Homes with larger families (3+ loads per week), pets that shed heavily, or long vent runs should consider cleaning every 6–9 months.

Don't Wait for a Sign

By the time you notice these signs, the buildup is already significant. The safest approach is annual professional cleaning — it's affordable, takes under an hour, and could save your home. At B&J Air Solutions, dryer vent cleaning starts at just $149.