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Fix a kitchen exhaust fan that will not pull

We'll confirm the fan runs, check the filter, duct, and vent damper—or tell you when to call a pro.

Troubleshooting · Home appliances
15–45 min
What you'll need
  • Hot soapy water or dishwasher (for grease filter)
  • Flashlight
  • Foil tape or duct clamp (if reconnecting duct)
  • Screwdriver set (Phillips and flathead)
Step 1 of 10

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Steps

Goal: Confirm the fan runs but does not pull, then check the filter, duct, and vent damper.

  • Turn the kitchen exhaust fan on and hold a lit match or boil water. If the flame or steam does not move toward the hood, the fan is not pulling.
  • Good: Fan runs but no suction—proceed to Clean the filter.
  • Bad: Flame or steam moves—fan is pulling. No action needed.

Clean the filter

Goal: Rule out a clogged grease filter—the most common cause of weak suction.

  • Turn off power at the circuit breaker. Remove the grease filter (usually slides out or unclips).
  • Soak or wash the filter. Let it dry and reinstall.
  • Good: Filter was clogged—clean and test. Often fixes the problem.
  • Bad: Filter was clean—proceed to Check duct and damper.

Check duct and damper

Goal: Rule out a loose duct connection and a stuck vent damper.

  • Turn off power. Open the hood or remove the filter to access the duct connection.
  • Check the duct connection under the hood. Reconnect if loose; secure with foil tape or a clamp.
  • Check the vent damper. Free it if stuck.
  • If you can access the attic, trace the duct to the roof or wall cap. Straighten kinks, reconnect joints, clear blockage.
  • Good: Duct connected and damper free. The fan should pull.
  • Bad: Duct inaccessible—call a pro.

When to get help

Call a pro if:

  • The duct runs through walls and you cannot access it.
  • The roof or wall cap is damaged or inaccessible.
  • You have cleaned the filter and checked the duct and the fan still does not pull.
  • You are not comfortable working with ductwork.

Do not work in an unsafe attic.

Verification

  • The fan runs and a lit match or steam is drawn toward the hood.
  • Air exits at the roof or wall cap.
  • No unusual noise or vibration.
  • The filter is clean and the duct is connected.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify the fan runs but smoke or steam is not pulled.
  2. Grease filter Remove, clean, and reinstall the grease filter.
  3. Duct and damper Check duct connection, damper, and duct path for blockage.
  4. Clean or reconnect Reconnect duct, free damper, or clear blockage.
  5. Call a pro Duct inaccessible, roof cap damaged, or still not pulling—call a pro.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether the fan motor runs
  • Whether the filter was cleaned
  • Duct path and accessibility
  • Damper and duct connection status
  • Steps already tried

Does the fan run but smoke or steam is not pulled?

Turn the fan on. Hold a lit match or boil water. If the flame or steam does not move toward the hood, the fan is not pulling.

Turn the fan on and listen for the motor. Hold a lit match or boil water. Fan runs, no pull: filter, duct, or damper fault. Flame or steam moves: fan is pulling—no problem. Fan does not run: different problem—see fix-range-hood-will-not-turn-on.

Yes No

You can change your answer later.

No action needed

The kitchen exhaust fan pulls correctly. No further action required.

Done

Is the grease filter clean?

A clogged grease filter blocks airflow. Clean or replace it.

Remove the grease filter. Soak in hot soapy water or run through dishwasher. Reinstall. Clean: proceed to duct. Was clogged: clean and test—often fixes the problem.

Yes No (was clogged)

You can change your answer later.

Clean filter and test

Clean the grease filter. Reinstall and test. The fan should pull better. If still weak, check the duct and damper.

Done

Is the duct connected and the damper free?

Check the duct connection under the hood and the vent damper.

Turn off power. Check the duct connection under the hood—reconnect if loose. Check the vent damper—free it if stuck. Good: duct attached, damper free. Bad: loose or stuck—fix and test.

Yes No

You can change your answer later.

Reconnect duct or free damper and test

Reconnect the duct to the hood with foil tape or a clamp. Free the vent damper if stuck. Reassemble and test. The fan should pull if that was the only fault.

Done

Can you access the duct to check for kinks or blockage?

The duct may run through the cabinet to the attic and roof.

Check if you can safely access the duct path. Yes: trace the duct, straighten kinks, clear blockage. No: call a pro—duct may be blocked or disconnected.

Yes No

You can change your answer later.

Is the duct clear—no kinks or blockage?

Trace the duct from the hood to the roof or wall cap.

Trace the duct. Straighten kinks. Reconnect any disconnected joints. Clear blockage. Check the roof or wall cap. Good: duct clear. Bad: kinked or blocked—fix and test.

Yes (still not pulling) No (found issue)

You can change your answer later.

Fix duct and test

Straighten kinks, reconnect joints, clear blockage. Reassemble and test. The fan should pull.

Done

Call a pro

Call a pro if the duct is inaccessible, the roof cap is damaged, you have checked everything and the fan still does not pull, or you are not comfortable with ductwork.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a kitchen exhaust fan run but not pull?
Common causes: clogged grease filter, blocked or disconnected duct, kinked flexible duct, or stuck vent damper. The fan spins but air cannot flow. Check the filter first—it is the most common cause.
Can I fix a kitchen exhaust fan that will not pull myself?
Yes. Clean or replace the grease filter. Check the duct connection under the hood and in the attic if accessible. Free a stuck damper. Turn off power at the breaker before opening the hood. Call a pro if the duct is inaccessible.
When should I call a pro for a kitchen exhaust fan?
Call a pro if the duct runs through walls and you cannot access it, the roof or wall cap is damaged, you have cleaned the filter and checked the duct and the fan still does not pull, or you are not comfortable working with ductwork.

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