web analytics

How to Fix a Stuck Fireplace Damper

Use a wire brush and WD-40 to open a stuck fireplace damper.
Share on Facebook0Tweet about this on Twitter0Pin on Pinterest7Email this to someoneShare on Reddit0Share on Google+0

Not being able to open your throat damper makes your fireplace unusable.  If you light a fire, smoke will flow out of the fireplace into the room, if the damper is closed.  It’s not unusual to find that the handle that opens and closes the damper is stuck.

(If the damper handle is not stuck, but you just aren’t sure how to open or close the damper, click here for directions.)

Put on goggles and a dust mask.  Look up inside the fireplace with a flashlight.  Look for evidence that the damper is jammed by debris, nests, or dead animals that have fallen into the chimney.  If you suspect a jam, it’s best to let a chimney sweep clear it.  Bird and bat droppings can contain bacteria that are extremely dangerous to humans.  A chimney sweep is equipped to clear the jam safely.

The most likely cause of a stuck fireplace damper is a build-up of rust, soot, and creosote on the hinges of the damper.  Soot and creosote can build up from the normal use of the fireplace.  Dampers rust when rain comes down the chimney because there is no chimney cap or the chimney cap has deteriorated.

Rusty fireplace damper

The damper will have pins on each end that drop into grooves in the sides of the fireplace, forming hinges.  If the damper is not resting in these grooves, it will not open and close properly and must be re-seated in the grooves.  (Most steel plate throat dampers can be removed by detaching the damper handle and lifting the damper out of the grooves.) You can have a chimney sweep clean the damper area, or you can do it yourself.High Temperature Lubricant

Lay 4-mil plastic sheeting on the floor in front of the fireplace and tape some to the sides of the fireplace.  Put on old clothes or a disposable paper suit, and a hat.  You’ll need safety goggles, a disposable dust mask or respirator and a wire brush.

  • First, brush the damper, giving special attention to the hinges.
  • If the step above doesn’t work, clean the track that the handle runs in and the point where it is attached to the damper. 
  • If the prior two steps don’t cure the stuck damper handle, tap the handle with a sledge hammer after applying WD-40 to the part of the handle that is inside the fireplace.
  • Once you have the damper opening and closing easily, apply some high temperature lubricant to the hinges and you’re done.

WD-40 was first used to prevent rust on the Atlas missile in the 1950.  The WD actually stands for water dispersal.  Spray WD-40 on your chimney damper to protect it from rust.  It will also keep it lubricated so  it opens and closes easily.

If the handle of the stuck fireplace damper is broken, there are replacement damper handles for both fireplace throat dampers and chimney top-sealing dampers.

Vestal Poker Style Damper Handle

If the steel plate in the throat damper is too rusted, you need just a replacement damper plate.

Replacement damper plate or replacement throat damper?

If the whole throat damper has rusted through, you need to replace the throat damper (which includes the damper plate.)

Throat damper: valve plate only

Throat damper: valve plate only

If the damper is missing, replace it with a top damper, so called because it installs at the top of the chimney.  A cable running down the chimney to the firebox allows you to open and close the damper.  Top dampers fit more tightly than most throat dampers and pay for themselves in energy savings by keeping heated air inside the home.

© 2017 FireplaceMall.com and PennVentures, Inc.
Want to read more articles like this? Sign up for Hearthside Living, our newsletter featuring expert advice, decorating tips, and special deals from FireplaceMall.com.
Share on Facebook0Tweet about this on Twitter0Pin on Pinterest7Email this to someoneShare on Reddit0Share on Google+0

Last updated by at .


Susan shares ways to make homes, especially those with fireplaces, renewing spaces for families. When not writing for FireplaceMall.com, she can often be found by a fireplace with a book in hand.

Posted in Fireplace and Chimney Maintenance Tagged with:

Leave a Reply

Your email address will not be published. Required fields are marked *