Cold Air Coming Through My Gas Fireplace

Putting a bag or plastic over the box outside does nothing.

Cold air coming through my gas fireplace.

We recently bought a 1996 house which has a majestic gas fireplace. I m guessing that that along with a void between the back of the insert and the flue is allowing cold air to come down the chimney past the back of the insert and underneath the insert and out into my family room. Over years of use dampers can become rusted or warped. If the wall behind the fireplace is uninsulated which is common the problem will be worse.

Install or replace the damper a damper is a metal flap in your chimney that blocks cold air from coming in and warm air from escaping. Remembering to keep the damper closed when the fireplace isn t being used will block the cold air that wants to enter your home. Ways to prevent cold air entering your home through your fireplace. Use our flue cover to stop the outside air from coming in through the flue.

It seems that the gas insert s enclosure bottom must sit off of the bottom of the fireplace opening by about an inch. The air comes in through the large unsealed hole that is left from the pipe going through. Use our magnetic fireplace vent cover to stop the inner cold air circulation from the vents. You will stop the cold drafty air in the winter and keep warm humid air from coming in during the summer months.

This air is direct to the surrounding area behind the fireplace and comes out through any vent usually the lower grill making the floor icey cold. When you close the flue you re essentially plugging the chimney with a metal flap. Stuffing the hole s with batt insulation will slow the draft down. Also you may discover that the knockout for the gas line is letting cold air come in.

Keeping your home warmer in the winter can involve a couple steps. Step one is stopping the cold air draft.