How to Clean Your Dryer Vent

The lint trap catches most of the debris from your clothes, but not all of it. The rest travels through the vent duct on its way outside. Over time, that lint accumulates in the duct, restricting airflow. A clogged vent makes your dryer run longer, costs more in energy, and—here’s the scary part—is a fire hazard. Clothes dryers cause thousands of house fires every year, and clogged vents are a leading cause.

Why This Matters

A dryer vent clogged with lint is a problem on multiple levels:

• Fire hazard – Lint is highly flammable; restricted airflow means higher temperatures
• Longer drying times – Clothes take multiple cycles to dry
• Higher energy bills – The dryer runs longer and works harder
• Wear on the dryer – Overheating damages components
• Moisture problems – Trapped humidity can cause mold in the duct or walls
• Carbon monoxide risk – For gas dryers, a blocked vent can cause CO to back up

Cleaning the vent isn’t optional maintenance. It’s essential safety.

Warning Signs of a Clogged Vent

• Clothes take forever to dry – More than one cycle for normal loads
• Dryer feels hot – Excessive heat on the outside or top
• Burning smell – Lint is getting too hot
• Lint visible around the dryer – Coming from the back or underneath
• No lint on the lint trap – Means lint is going somewhere else
• Musty smell on clothes – Moisture isn’t escaping properly
• Dryer shuts off mid-cycle – Overheating safety switch triggered

If you notice any of these, stop using the dryer until you’ve cleaned the vent.

Types of Dryer Vents

Short, Straight Runs

The easiest to clean. Duct runs directly from dryer to exterior wall.

Long or Complex Runs

Multiple bends, long horizontal sections, or vertical runs to the roof. Harder to clean and more prone to clogging.

Flexible Duct

The accordion-style flexible duct is prone to lint accumulation in the ridges. Rigid metal duct is better.

Step-by-Step Cleaning

Step 1: Pull the Dryer Out

1. Unplug the dryer (electric) or turn off gas supply (gas)
2. Pull the dryer away from the wall
3. Disconnect the duct from the back of the dryer
   • Usually a clamp holding the duct on
   • Some have screw-type clamps, others use spring clamps

Step 2: Clean Behind the Dryer

While you have access:

• Vacuum lint from the floor and wall behind the dryer
• Clean the exterior vent of the dryer itself
• Check the duct connection point for damage

Step 3: Clean the Duct

For accessible ducts:

1. Insert your vacuum hose into the duct as far as it will reach
2. Vacuum thoroughly, working the hose around bends if possible
3. If you have a dryer vent brush kit:
   • Insert the brush into the duct
   • Rotate while pushing through
   • Pull back to drag lint out
   • Repeat until no more lint comes out
4. Vacuum again to remove dislodged debris

For long or complex ducts, a brush kit with flexible rods can reach further. Work from both ends if possible.

Step 4: Clean the Exterior Vent

1. Go outside and locate the vent hood
2. Remove the cover if possible
3. Vacuum or brush out any lint
4. Check that the flapper moves freely
5. Clear any debris or vegetation blocking the opening

Step 5: Reassemble

1. Reconnect the duct to the dryer
2. Make sure the clamp is secure
3. Push the dryer back into place
4. Plug in or turn on gas
5. Run the dryer on air-only for a few minutes to blow out any remaining debris

Professional Cleaning

If your vent run is:

• Very long (over 15 feet)
• Goes through a crawlspace or attic
• Goes up through the roof
• Has multiple bends
• Uses flexible plastic or foil duct

Consider professional cleaning. They have specialized equipment that can clean the entire run thoroughly.

Rigid vs. Flexible Duct

If you still have flexible plastic or foil duct, replace it:

• Rigid metal duct – Best for airflow and least prone to clogging
• Semi-rigid metal duct – Good compromise, acceptable for short sections
• Flexible foil/plastic – Avoid. Prone to clogging, can melt or catch fire

Rigid duct might cost more upfront but is safer and easier to maintain.

DIY vs. Call a Pro

DIY: Short, accessible duct runs, routine cleaning, exterior vent maintenance.

Call a pro: Long or complex duct runs, roof vents, suspected damage, or if you’re not comfortable moving the dryer. Find an appliance repair service →

How Often to Clean

• Minimum: Once a year
• Heavy use: Every 6 months
• Long/complex runs: Every 6 months
• Flexible duct: More often, or replace with rigid

The Bottom Line

Dryer vent fires are preventable. If your dryer is taking longer than it used to, the vent is probably the culprit. Spend an hour once a year cleaning it out, or hire a pro to do it. The alternative is a lot more expensive—and a lot more dangerous.