Chimney Sealing

What Is A Chimney Sealing Balloon?

A chimney sealing balloon is an inflatable plug that sits snugly inside your fireplace flue and blocks air from moving between your home and the outdoors. You slide it into place above the damper, inflate it until it gently presses against the flue walls, and suddenly that open chimney is no longer acting like a hidden window to the outside.

Most chimney balloons are made from durable, flexible material with a long inflation tube that hangs down into the firebox, so you can install, adjust, or remove it without special tools. They are designed for unused fireplaces, which means you can seal drafts all fall and winter, then deflate and store the balloon when you are ready to use the fireplace again. The result is a simple, reusable draft stopper that helps cut energy loss, reduce cold spots, and keep the room around your hearth more comfortable.

Why Use A Chimney Balloon?

A chimney that is open but rarely used quietly wastes energy day after day. A chimney sealing balloon is a small, low-effort upgrade that closes that gap so your heating and cooling system is not constantly fighting an invisible hole in the wall. You get a more comfortable room, fewer drafts, and a little less work for your HVAC.

Cut Drafts And Energy Waste

An open flue lets warm indoor air rise out of the house while cold outside air slips in around the fireplace. By sealing the flue higher up with an inflatable chimney balloon, you slow that airflow and help keep conditioned air where it belongs. That can translate into a more stable room temperature and lower energy use over the season.

Block Odors, Noise, And Debris

If you get whiffs of soot, city smells, or just “old fireplace” odor, the chimney path is probably part of the problem. A chimney sealing balloon creates a barrier that helps keep outside smells, dust, and small bits of debris from drifting into the living space. It can also take the edge off street noise and wind sounds that travel through the flue.

Keep Out Pests

Birds, insects, and small critters love quiet, dark chimney spaces. A properly sized balloon makes it much harder for pests to move from the flue into the room below. Used along with a good chimney cap, it adds another layer of protection so you are less likely to deal with surprise visitors.

Easy To Install, Easy To Remove

Most chimney balloons are designed for everyday homeowners and building staff, not specialists. You measure the opening, position the balloon above the damper, and inflate it until it holds snugly in place. When you are ready to use the fireplace again, you simply deflate, remove, and store it for the next off season.

Shop Chimney Sealing Balloons at Conservation Mart

Ready to plug that drafty fireplace? Browse our selection of chimney sealing balloons and pick the size and shape that matches your flue. Each product listing calls out key details like opening dimensions, compatible flue type, material, and included accessories so you know exactly what you are getting before you add it to the cart.

Use the filters to narrow options by size, shape, and construction, whether you are sealing a standard masonry fireplace or a more unique opening. Choose the chimney sealing balloon that fits your measurements, order what you need for each fireplace, and start turning cold, unused hearths into quieter, more efficient parts of your building.