Lint trap vs dryer vent: what each one does, and how to clean both
The lint trap, or lint screen, is a filter inside the dryer that you empty every load. The dryer vent is the exhaust duct that carries hot, damp air from the dryer to the outside, and it is not something the screen protects. The CPSC and USFA tell you to clean both: the screen every load, and the vent and exhaust duct periodically. This guide shows how each works and how to check them.
By Steve · Published October 20, 2026
The short answer
- The lint trap is a screen inside the dryer. The dryer vent is the duct from the dryer to the outside. They are different parts.
- Clean the lint screen every load. The CPSC says before or after each load, and the USFA says before and after each cycle.
- The CPSC says lint can still build up in the dryer or in the exhaust duct, so cleaning the screen is not enough.
- Clean the vent and exhaust duct periodically, and check the outside vent while the dryer runs.
- A standard dryer vent cleaning is $129, with an airflow reading before and after.
Two parts, two jobs
The lint trap is the screen you pull out of the dryer door or top. It catches lint as the clothes tumble. You empty it by hand.
The dryer vent is the duct behind the dryer. It carries the hot, damp air out of the house through a hood on the wall or a cap on the roof. The lint that gets past the screen travels with that air, and some of it stays in the duct.
People often assume that a clean screen means a clean vent. The CPSC says otherwise: lint can build up in the dryer or in the exhaust duct, block airflow, and cause heat to build up.
What to do, and how often
| Lint trap | Dryer vent | |
|---|---|---|
| What it is | Screen inside the dryer | Exhaust duct to the outside |
| How often | Every load (CPSC: before or after; USFA: before and after) | Periodically, and when you see signs |
| Who does it | You | You for the reachable parts, a pro for the run |
| What blocks it | Lint film, a dirty screen | Lint in the duct, a crushed hose, a nest, a stuck flap |
The USFA adds: never run the dryer without the lint filter, and check the venting behind the dryer to make sure it is not damaged, crushed or restricted.
Checks you can do in five minutes
- Empty the screen. If the mesh looks cloudy, look at it against a light. A film of lint you can barely see through still restricts air.
- Look behind the dryer. Is the hose folded, kinked or flattened? That costs nothing to fix.
- Go outside while a load runs. You should feel steady warm air and see the flap open. If not, the vent or the exhaust duct may be blocked. This is the CPSC’s check and the USFA’s.
- Notice the dry time. The CPSC names damp clothes at the end of a normal cycle, or longer drying, as a sign of a blocked screen or duct.
Our two-minute checklist scores your answers, and the signs of a clogged dryer vent guide explains each one.
When the screen is clean and the dryer is still slow
Then look past the screen. A long upstairs run, a pinched hose and a bird nest are the usual culprits. Why a dryer takes too long to dry lists seven causes in order, and where an upstairs dryer duct goes explains the long-run case.
You can clean the parts you can reach. The DIY guide covers where to stop. For the full run, the cleaning is $129 for a standard wall exit and $179 for a roof or second-floor exit, with an airflow reading before and after. If you would rather check first, a camera inspection and airflow test is $89.
The services this guide is about
Common questions
- Is the lint trap the same as the dryer vent?
- No. The lint trap is the screen inside the dryer that catches lint. The dryer vent is the exhaust duct that carries hot, damp air from the dryer out of the house. You empty the lint screen yourself. The vent runs through a wall, an attic or a roof, and is harder to reach.
- If I clean the lint trap every load, do I still need to clean the vent?
- Yes. The CPSC says lint can build up in the dryer or in the exhaust duct, and tells you to clean both the lint screen and the vent periodically. The screen does not catch everything, and the vent can also be blocked by a crushed hose or a nest.
- How often should I clean the lint trap?
- Every load. The CPSC says before or after each load, and the USFA says before and after each cycle. Never run the dryer without the lint filter in place.
- How do I check the dryer vent?
- Start a load, go outside to the vent hood or roof cap, and check that exhaust air is coming out and the flap opens. Both the CPSC and USFA give this check. Also check that the hose behind the dryer is not damaged, crushed or restricted.
- My lint trap is clean but my dryer is slow. Why?
- The CPSC says damp clothes at the end of a normal cycle, or drying that takes longer than normal, may mean the lint screen or the exhaust duct is blocked. If the screen is clean, look at the hose behind the dryer and the outside vent next.
- What does a professional dryer vent cleaning include?
- The full run, the lint trap cavity under the screen, the transition hose, and the exit hood and flapper, with an airflow reading before and after and camera footage. A standard wall exit is $129, and a roof or second-floor exit is $179.
Sources
- Overheated Clothes Dryers Can Cause Fires (Publication 5022) — U.S. Consumer Product Safety Commission. Source for cleaning the lint screen each load, lint building up in the dryer or exhaust duct, cleaning the vent and exhaust duct periodically, and the outside vent check. Accessed October 20, 2026.
- Clothes Dryer Fire Safety — U.S. Fire Administration, FEMA. Source for cleaning the lint filter before and after each cycle, not using the dryer without a filter, and checking the venting behind the dryer. Accessed October 20, 2026.
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