Every load of laundry sheds lint. The trap catches most of it, but a steady stream gets past and settles inside the vent line that runs from your dryer to the outside wall. Lint is extremely flammable, and a dryer that is forced to run hot against a blocked vent is a real fire risk. Dryer fires are consistently one of the leading causes of house fires in the United States, and clogged vents are the main reason they start.
The mechanics are simple. Your dryer works by pushing hot, moist air out through the vent. When the vent is partially blocked, that heat has nowhere to go. The dryer runs hotter and longer, lint near the heating element gets baked, and the buildup inside the line sits in the path of every hot cycle. All it takes is one hot spot.
The warning signs show up slowly, which is why so many homeowners miss them. Clothes take two cycles to dry when they used to take one. The top of the dryer feels hotter than it used to. The laundry room gets humid while the dryer runs, or you catch a faint burning smell. Outside, the vent flap barely opens when the dryer is on, or you can see lint collecting around the exterior vent hood.
Any one of those signs means the vent is restricted. A burning smell means stop using the dryer until the vent is cleared. That smell is lint getting hot, and it is the last warning you get before the problem becomes a fire.
Some homes are at higher risk than others. Long vent runs, common when the laundry room sits in the middle of the house, clog faster because lint catches on every elbow and sag. Vents that exit through the roof clog faster than short wall runs. Big families running daily loads accumulate lint far faster than a couple doing a few loads a week.
The fix is straightforward. We clear the entire vent line, not just the first few feet behind the machine, using rotary brushes that run the full length to the exterior termination. We clear the vent hood, check that the flapper moves freely, and verify strong airflow at the exterior vent before we leave. Most households should have this done once a year.
If you just bought a home, put it at the top of the list. You have no way of knowing when the vent was last cleaned, and it is one of the cheapest bits of insurance you can buy for your house. Call (302) 378-7002 and we will get it taken care of.