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How to Clean a Dryer Vent (and Why a Clog Kills Heat)

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When you clean a dryer vent, start at the lint filter and outside flap. A restricted duct can keep moist air from leaving, slow drying and limit heat. The schedule varies by manufacturer, and a duct inside a wall or roof is a professional job.

Clean the lint filter after every load

Remove visible lint from the filter and reinstall it before starting the next cycle. GE says to clean the lint filter each time the dryer is used. If fabric-softener residue is present, GE says the filter can be washed with warm water and soap. Let it dry fully before putting it back.

The lint screen is not the whole vent. Lint can also collect in the exhaust route and at the outside flap. If drying takes longer, the dryer overheats, or a supported model’s vent test reports a restriction, inspect only the visible, accessible path and arrange professional cleaning as needed. See the dryer not-heating hub for related airflow clues, or the warm-but-not-hot guide for load and weak-heat checks.

Check the accessible exhaust path

Look behind the dryer only if the appliance can be reached without pulling a gas line, hardwired cord or heavy unit. The visible hose should not be crushed, pierced or sharply bent. At the outside wall, look for a flap blocked by lint, snow or ice. LG says the outside flaps should open fully; Samsung calls for sealed ducting without sharp bends.

GE recommends rigid metal duct and permits flexible metal, noting that flexible metal can increase drying time. It specifies a four-inch outside collar and says not to use plastic. Samsung also says not to use plastic or foil and gives a maximum duct length for the model; each 90-degree turn reduces that maximum by six feet. Do not use one brand’s permitted length for another brand’s dryer.

If the duct runs through a wall or roof, do not push a brush into the cavity. LG says interior wall duct cleaning should be done by a professional. A vent cleaner can inspect the duct length, bends and outside termination without opening the dryer cabinet.

Follow the schedule for the brand

The cited manufacturers do not give one universal schedule:

  • GE says to clean the vent at least once a year.
  • Samsung says once or twice each year.
  • LG recommends professional cleaning once a year.
  • Whirlpool and Maytag say every one to two years or as needed.

Use the schedule in your model’s manual, especially if the dryer runs often or the vent route is long. Clean the lint filter after every load regardless of the annual vent schedule. If drying time increases or a vent test reports a blockage, arrange cleaning sooner.

A vent blockage test

Some Samsung dryers display a vent-test result. Samsung uses 0 or End for a clear duct, Clg or Cg for a blockage, C80 or C8 for around 80 percent blocked, and C90 or C9 for more than 90 percent. C1 or CL1 indicates laundry is in the drum. Ct means the test’s ambient temperature is outside its range; Samsung says to wait an hour at room temperature.

The code is a clue, not a reason to open the machine. Clean the lint filter and accessible outlet. If the test still reports a severe restriction, arrange professional vent cleaning. If the test passes but the dryer still does not heat, ask appliance service to diagnose it.

A limited electric-dryer test

GE describes disconnecting the vent and running one or two loads to see whether the duct is the cause. This is for electric dryers only. Do not use the test on a gas dryer: GE warns that running a gas dryer without the exhaust can expose the home to carbon monoxide. Do not move an appliance that is hardwired, connected to gas or too heavy to handle safely.

If the vent cannot be disconnected safely, skip the test and call a professional. Stop if lint blows into the room, the dryer overheats or the outside flap does not move. Do not run repeated loads with the exhaust disconnected.

Dryer vent cleaning path from the lint filter to the visible hose and outside flap, ending with professional cleaning for a wall or roof duct.1Clean lint filterRemove lint eachload; let a washedfilter dry.2Inspect visiblehoseLook for a crush,hole or sharp bend.3Check outside flapKeep lint, snow andice from blockingit.4Call a vent proFor wall, roof orunsafe connectedsections.
Dryer vent cleaning path from the lint filter to the visible hose and outside flap, ending with professional cleaning for a wall or roof duct.1Clean lint filterRemove lint each load; let a washed filterdry.2Inspect visible hoseLook for a crush, hole or sharp bend.3Check outside flapKeep lint, snow and ice from blocking it.4Call a vent proFor wall, roof or unsafe connected sections.
Owner checks stop at visible, accessible areas; wall and roof ducts need professional cleaning.
Dryer component referenceNumbered labels identify parts discussed in the guides; positions are not model-specific.1Lint FilterGeneric component label2DrumGeneric component label3BeltGeneric component label4MotorGeneric component label5Heating ElementGeneric component label6Gas Burner AssemblyGeneric component label7Thermal FuseGeneric component label8High Limit ThermostatGeneric component label9BlowerGeneric component label10Vent HoseGeneric component label11Wall VentGeneric component label12Exhaust HoodGeneric component label13Door SwitchGeneric component label
  1. Lint Filter
  2. Drum
  3. Belt
  4. Motor
  5. Heating Element
  6. Gas Burner Assembly
  7. Thermal Fuse
  8. High Limit Thermostat
  9. Blower
  10. Vent Hose
  11. Wall Vent
  12. Exhaust Hood
  13. Door Switch
Generic reference only. Component positions and access vary by model. Do not open panels or touch electrical, gas, or refrigerant components.

Stop and call a pro

Use a professional for a duct inside a wall or roof, a crushed section behind a connected dryer, a blocked termination that cannot be reached safely or any gas installation issue. Keep the exhaust attached on gas models. If a dryer is hot to the touch, smells burnt or displays a recurring vent code, stop the cycle until the cause is corrected.

Frequently asked questions

Is a flexible metal vent allowed?

GE permits flexible metal but says it can increase drying time. GE and Samsung reject plastic; Samsung also rejects foil. Follow your model’s installation instructions. For a visible exterior check, GE specifies a four-inch duct collar and says to inspect the outside flap for lint, snow or ice. LG’s owner check is narrower: look for a crushed or damaged rear hose and confirm that the exterior flap opens fully. If the vent runs through a wall or roof, stop at the visible connection and arrange professional cleaning.

Should I clean the vent every year?

GE says at least yearly, Samsung says once or twice annually, LG recommends an annual professional cleaning, and Whirlpool/Maytag say every one to two years or as needed. Use your brand’s instructions and clean the lint screen after every load.

Can I use a vent brush through the wall?

LG says interior wall ducts should be cleaned professionally. Do not push a brush into a wall cavity or use a tool where you cannot see its path.

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Frequently asked questions

How often should I clean a dryer vent?

The manufacturers list different schedules: GE at least yearly, Samsung once or twice a year, LG professional cleaning annually, and Whirlpool/Maytag every one to two years or as needed. Follow the instructions for your model.

Can I use plastic dryer vent hose?

GE and Samsung specify metal ducting and say not to use plastic. Check the installation guide for your model and have an unsuitable in-wall duct replaced professionally.

Can I run a gas dryer with the vent disconnected?

No. GE warns that a gas dryer must not run without its exhaust because of carbon monoxide. Keep the vent attached.

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