How to Clean Your Dryer Vent (And Why It Matters)

Cleaning your dryer vent is one of the most important --- and most overlooked --- home maintenance tasks. A clogged dryer vent doesn't just slow your drying. It's a leading cause of house fires. This guide covers everything you need to know: why it matters, how often to do it, and how to do it yourself.

Why Dryer Vent Cleaning Matters

Every time your dryer runs, it pushes hot, moist, lint-laden air through a duct to the outside of your home. Over months and years, lint accumulates along the walls of that duct --- especially at bends and transitions. Eventually, it restricts airflow significantly.

• Restricted airflow forces the dryer to run longer, increasing energy use
• Heat builds up inside the dryer, stressing components and reducing lifespan
• Lint in a hot duct is a fire hazard --- dryer fires cause an estimated 2,900 home fires per year in the US according to the NFPA
• The thermal fuse can blow from overheating, requiring repair

How Often Should You Clean the Dryer Vent?

• Every year: standard household use (4--5 loads per week)
• Every 6 months: large families, frequent use, or long duct runs
• Every 3 months: households with pets (pet hair accelerates lint buildup)
• Immediately: if clothes are taking more than one cycle to dry, or if the dryer feels hot to the touch

What You'll Need

• Dryer vent cleaning kit (flexible rods with a brush head --- available at hardware stores for $20--$30)
• Vacuum cleaner with hose attachment
• Screwdriver (to disconnect the vent hose from the dryer)
• Flashlight

Step-by-Step: Cleaning the Dryer Vent

Step 1: Disconnect and Clean the Hose

Pull the dryer away from the wall and unplug it (or turn off the gas valve for gas dryers). Disconnect the flexible hose from the back of the dryer. Shake out loose lint and vacuum the inside of the hose. If the hose is a foil accordion type, consider replacing it with rigid metal duct while you have it disconnected.

Step 2: Clean From Inside

Insert the dryer vent cleaning brush into the dryer's exhaust outlet and push it through the duct toward the outside vent cap. Use the flexible extension rods to reach as far as possible. Rotate the brush as you push and pull to dislodge lint from the duct walls.

Step 3: Clean From Outside

Go to the exterior vent cap (on the side of your house or roof). Remove the cap cover and use the brush kit to clean from the outside in. Vacuum up any lint that falls out. Make sure the vent flap opens and closes freely --- a stuck flap reduces airflow and can let pests in.

Step 4: Reconnect and Test

Reconnect the vent hose and push the dryer back (leaving a few inches of space so the hose doesn't crimp). Plug in the dryer and run it on high heat for 10--15 minutes. Go outside and confirm you feel strong, warm airflow from the vent cap.

When to Hire a Professional

If your duct run is long, goes through walls or the attic, or has multiple 90-degree bends --- professional cleaning with a high-powered rotary brush and vacuum is the better option. Professionals can also inspect for bird nests, duct damage, or improper installation that DIY cleaning won't reveal.

Professional dryer vent cleaning typically costs $80--$150 and takes about an hour.