How to Clean a Dryer Lint Filter and Vent for Fire Safety
Clean the lint filter every cycle and check the vent, back of the dryer, and outdoor cover, following U.S. Fire Administration advice.
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Lint is fuel, and a dryer makes heat. When lint builds up in the filter and the vent, airflow drops and a routine load can turn into a fire. The U.S. Fire Administration (USFA) lists failure to clean as the leading factor contributing to the ignition of clothes dryer fires in homes from 2018 to 2020, at 31 percent. This guide shows how to clean the lint filter and the vent, in the order that matters, using the USFA's own advice.
Summary
Clean the lint filter before and after every cycle, and never run the dryer without it. The USFA also advises cleaning the filter with a nylon brush at least every 6 months. Check the venting system behind the dryer for damage, crushing, or restriction, and clean the back of the dryer where lint builds up. Confirm that the outdoor vent covering opens when the dryer runs. The sections below give the steps for the filter, the vent, and the warning signs.
Dryer Cleaning Schedule at a Glance
| Part | How often | How |
|---|---|---|
| Lint filter | Before and after every cycle | Remove lint by hand; brush the mesh with a nylon brush at least every 6 months |
| Vent duct | Regularly inspect and clean | Check for damage, crushing, or restriction; clear lint or hire a service |
| Behind the dryer | With each vent check | Clean lint from the back of the dryer |
| Outdoor vent cover | With each vent check | Confirm the flap opens when the dryer runs |
The table shows the rhythm. The filter is a per-cycle habit. The vent is a regular inspection job, with periodic servicing by qualified personnel. The back of the dryer and the outdoor cover get checked at the same time, so nothing in the airflow path goes uninspected.
Clean the Lint Filter
Pull the filter out of its slot before and after each cycle and remove the lint with your fingers. Put the lint in a wastebasket, not back into the machine. Slide the filter fully back into place before you start the next load. A filter that sits loose or crooked lets lint past it and into the machine, so check that it seats flat.
At least every 6 months, clean the filter mesh itself with a nylon brush. Let the filter dry fully before you put it back. Replace a filter that is torn, warped, or no longer fits. The USFA advises never to run a dryer without a lint filter.
Clean the Vent
Unplug the dryer first, or shut off the gas supply if you have a gas model. Pull the dryer away from the wall far enough to reach the duct behind it, and look at the duct from both ends. The USFA advises checking that the venting system behind the dryer is not damaged, crushed, or restricted.
Remove lint by hand where you can reach it, and use a vent brush or a vacuum hose attachment on the duct as your dryer's manual allows. Replace any section that is crushed or torn, and see your dryer manual for the type of duct it requires. Do not forget to clean the back of the dryer, where lint can build up.
Next, check the outdoor vent covering from outside the house. The USFA advises making sure it opens when the dryer is operating. Clear away lint, leaves, or a nest from the opening. If the duct runs a long distance through walls, or you cannot reach the far end, hire a vent cleaning service for that part. The USFA states that the interior of the dryer and the venting system should be serviced and cleaned periodically by qualified service personnel.
Signs the Vent Needs Attention
Do not wait for a scheduled check if the dryer starts behaving differently. If loads take longer to dry than they used to, if the cabinet feels unusually hot, if you smell something burning, or if lint collects around the outdoor vent, stop using the dryer and check the filter and the vent before the next load.
A damaged, crushed, or restricted duct is a reason to fix the duct before you use the dryer again. If the problem continues after cleaning, call a professional and do not run the dryer until it has been checked.
What the USFA Data Show
The USFA's earlier report on clothes dryer fires in residential buildings, covering 2008 to 2010, estimated about 2,900 such fires each year. It reported that failure to clean was the leading factor in 34 percent of those fires, and that dust, fiber, and lint were the first items ignited in 28 percent. The report concludes that it is crucial for homeowners to regularly inspect and clean out the dryer vent.
The two reports cover different years and use different data, so the percentages differ. They point the same way: cleaning is the step that matters most.
Choosing Order
- Clean the lint filter first, before and after every cycle, and brush its mesh at least every 6 months. A clean filter keeps most lint out of the vent in the first place.
- Inspect the vent duct regularly for damage, crushing, or restriction, and clean it or hire a service.
- Finish at the outdoor vent covering. Confirm the flap opens when the dryer runs, then clean the lint from the back of the dryer before you push it back into place.
Before You Clean
- Unplug the dryer before you move it or disconnect the duct. For a gas dryer, shut off the gas supply first.
- Plug the dryer directly into a wall outlet, not an extension cord, as the USFA advises for major appliances.
- Have your dryer installed and serviced by a professional, as the USFA advises, especially when the vent run is long or damaged.
- See official site for your dryer model's manual if the filter location or the vent connection differs from the steps above.