How to Close a Chimney Damper
Keep cold air, debris, and critters from coming down your chimney
- Flashlight
- Protective gloves
- Safety goggles
Using a fireplace is a fairly straightforward process, but one essential part of the chimney you’ll need to understand how to use is the damper. This small metal or ceramic plate inside the flue puts you in charge of controlling the airflow through your chimney. The damper always stays open when the fire is on, to stop smoke and harmful gasses from filling the room. But if you forget to close the damper after the fire goes out, undesirable drafts, debris, and animals can enter your home.
Follow our step-by-step guide for how to close a chimney damper to help keep your home cozy and critter-free.
How to Close a Chimney Damper
Learning how to close a chimney damper is an essential but easy task. After ensuring any previous fire is completely out, you’ll locate the damper control and close it using the lever or pull chain. You’ll also need to know when to close a chimney damper—otherwise, you could end up breathing in mouthfuls of harmful smoke or have sky-high winter energy bills.
Check the Fire Is Completely Out
Wait for the fireplace flames to go out—or learn how to put out a fire properly—before closing your chimney damper to avoid smoke filling your living room.
Locate the Damper Control
Figure out the location of the control for closing your chimney damper. It's most commonly a metal lever, knob, ring pull, or chain. You'll usually find it on the fireplace surround or within the fireplace. You might want to use a flashlight to find the mechanism in a large, soot-covered fireplace.
Traditional throat dampers, positioned at the base of the flue, usually operate via a lever. Top-sealing chimney cap dampers are often controlled by a pulling chain.
Close the Damper Using the Lever or Pull Chain
You've found the closure mechanism, but now you need to figure out how to work it. If you don't have an instruction manual, do some simple detective work.
Often, you pull the lever down or towards you to close the damper. They sometimes have grooves that allow better control of incremental opening to adjust airflow. Some function in the way a key in a lock does. Knobs need to be fully slid in one direction or the other, and chains often pull down to close dampers. You might hear a distinctive sound when the damper fully closes.
Don a pair of protective leather gloves for this step. If the lever is inside the fireplace, it can be sooty and store residual heat.
Check the Damper Is Closed
Perform a quick physical check to ensure the damper is fully closed. Look up the chimney with the aid of a flashlight and while wearing protective glasses. If you feel a draft or can't see the metal plate of a throat damper blocking your flue, try moving the lever or chain in the other direction before rechecking.
If you're still not sure, light a rolled-up piece of paper directly under the chimney flue. If the damper is open, the airflow will pull the flame upwards.
Reopen the Damper When Relighting the Fire
Never light a new fire when the chimney damper is closed. Smoke, soot, and harmful gasses can quickly fill your room, covering walls and furniture and causing breathing difficulties.
DIY vs. Hiring a Pro
Learning how to close a chimney damper is a must when you have an operational fireplace. When you install a new fireplace, the contractor will explain how to operate it safely and efficiently. If you do it yourself, you'll have the instruction manual for the damper to follow.
If you’ve just moved into a new home with a cozy fireplace and you're not confident you're using the damper properly, you could get a mini masterclass from a chimney sweep near you. You might also need to call a local chimney repair company if the damper is jamming and won't close properly.
Some of the reasons a chimney damper won't close properly include shoddy installation, age-related damage, or heavy snow or ice affecting a top-sealing type. Poor chimney maintenance and a buildup of rust, debris, or creosote can also cause dampers to jam. Annual inspections and chimney sweep costs are worth it to help you avoid a damper disaster.
Always fully close the damper when you are not using the fireplace. This will lower your energy bills and prevent leaf litter or pesky critters from invading your home. When the fire is in use, you can adjust the damper’s level of openness to control the intensity of the flames, but it should never be fully closed.
The chimney damper and flue are separate but interconnected parts that help control airflow to and from your fireplace. The flue is the tunnel inside your chimney that ensures smoke and gasses leave your home safely. The damper is the part inside your flue that controls the airflow entering and exiting the tunnel.
