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Should the damper be open or closed on a gas fireplace?

Author

Daniel Moore

Published Jan 06, 2026

wood or gas . . . . always fully open the damper. If you're burning wood, keep it fully open until all the burning embers are completely burned out. If it's a gas log set, turn off the flames before the closing the damper as far as possible.

Do you need to open the damper on a gas fireplace?

"Fully Vented" gas logs must be burned in a fireplace that is capable of burning real wood and must be burned with the damper open. The reason for this is that they do not burn the gas cleanly and create exhaust that is very similar to burning a real wood fire. This exhaust needs to be able to go up the chimney.

Do you open or close the flue on a gas fireplace?

Our research shows that the flue on a gas fireplace should remain open during use or when the pilot light is lit. If the flue is closed in either instance, you risk a greater chance of carbon monoxide poisoning or a spark induced structure fire due to a buildup of toxins emitted by propane or natural gas burners.

How do you use a damper on a gas fireplace?

To open or close the damper, lift the handle and push or pull to move the damper to the desired position. Replace the handle when the damper is in place.

When should you close the damper on a fireplace?

You should close the damper on your fireplace once the fire and embers have all burned out. This prevents warm air in your house from escaping out the chimney. You should open the damper before lighting a fire and close it once the fire is done burning.

15 related questions found

Should the damper be open or closed?

The damper should be kept open until all embers are finished burning to prevent smoke from escaping into the home. When the fireplace is not in use, the damper should always be closed. An open damper is like an open window, allowing large amounts of heat from the home to escape.

Should damper be open or closed in summer?

Even if you have a chimney cap, it is a good idea to keep the damper closed in the summer. Chimney caps can become damaged creating a pathway for rainwater or pests to get into your chimney. Closing the damper will ensure that they can't get into your home through the fireplace.

Which way is damper open?

Conduct a visual check.

Lean in under your chimney just outside of your wood burning stove. You should find a metal device just within the chimney or flue opening. The damper is open if you can see through the damper up to your chimney. If you only see a metal plate, the damper is in a closed position.

How do I know if my gas fireplace vent is open?

Before lighting a fire, you can tell if the damper is open by placing your hand into the fireplace. If you feel a draft coming down the chimney, it is a good indicator that the damper is open. If you don't feel any cold air coming down the chimney, it means that the damper is closed.

Can you close the damper on a gas fireplace?

If you have installed gas logs in your fireplace, the damper should never be closed. If you have a pilot light constantly burning under your gas logs, shutting the damper puts you, your family and your pets at severe risk of carbon monoxide poisoning.

Is a damper and flue the same thing?

A damper is located in the flue of your chimney. The flue is where the smoke escapes when the fire is going. Dampers are placed inside of the flue to help control ventilation. Your damper should have a chain or handle that you can access in order to open and close it.

Where is the flue on a gas fireplace?

In many homes there is such a hole, but it's hidden inside the fireplace. That hole is the fireplace flue pipe. Wood-burning fireplaces usually have a damper installed in the upper part of the firebox.

How do you close a gas fireplace flue?

Push the lever up slightly to disengage it from its support tab and then pull it away from the tab horizontally as the damper lowers into a closed position. If your fireplace has pull chains, pull the longer chain to disengage the damper and then pull the shorter chain to close the flue.

What is the damper on a fireplace?

A damper is a small mechanism built into your fireplace and designed to seal up the chimney when the fireplace is not being used. The chimney damper prevents warm, interior air from drafting up the chimney and keeps cold air from entering.

What happens if you leave damper open?

Leaving your damper open during the summer forces your air conditioner to work harder in order to compensate for the incoming warm air. This causes an uneccessary spike in your utility bills, and if your HVAC system is old and overworked, might even force you to pay for a repair or replacement.

Is it OK to leave the flue open overnight?

The smoke from burning wood contains carbon monoxide, so in order to prevent this toxic byproduct from entering your home, it is important to leave the flue open overnight. This enables a draft to carry the compound out into the atmosphere, instead of sinking down the chimney and saturating the room.

What happens if damper is closed?

A closed throat damper will cause smoke to fill your house immediately when you start a fire. If you have a chimney with a closed top-mount damper It might take a few minutes for smoke to start filling the house, but you will eventually notice that there isn't enough airflow.

How do I get more heat from my fireplace?

Fortunately, there are several things homeowners can do to maximize fireplace heating efficiency:

  1. Install a Glass Fireplace Door. Installing a fireplace door is an effective and inexpensive solution to get more heat out of your fireplace. ...
  2. Use a Fireback. ...
  3. Upgrade Your Fireplace. ...
  4. Use the Damper to Turn Up the Heat.

How do I know if my flue is open?

Feeling the breeze is another method you can use to know whether you have an open or closed flue. Locate your hand inside the fireplace and wait to notice if you can feel the air flowing. When the flue is open, air will flow down the chimney.

Should damper be open or closed in winter?

In most homes, dampers going to the upstairs are open in the summer and closed in the winter. By closing the dampers to the upstairs in the winter, it allows for the heat to rise naturally after first being introduced into the lower levels of the home.

Does every fireplace have a damper?

Not all chimneys or flues have a damper. Open fireplaces can usually be found with damper located within the upper part of the firebox. It's common to find a damper as part of an open fireplace, but in some cases there may be no damper at all.

Why doesn't my gas fireplace put out heat?

Gas fireplaces do not fully heat a room if the type of system or BTU rating is inadequate for the space that they are in. Solutions such as blowers, gas inserts, and heat exchangers can be used to optimize the heat released from a gas fireplace.

How do you move a gas fireplace forward?

Steps to move a gas fireplace

  1. Find an appropriate location. Fireplaces are a beautiful focal point in any home, but not every home is designed to have a fireplace. ...
  2. Disconnect the Gas supply. ...
  3. Disassemble the fireplace and remove the unit. ...
  4. Move the fireplace to the new location. ...
  5. Assemble the fireplace.