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Top-Sealing Fireplace Dampers: Your Chimney’s Multi-Tasker

At Blue Sky Chimney Sweeps, we’ve often heard homeowners and customers complain about cold air coming down their chimney and into the living area, costing them extra money as they try to keep their home comfortable and warm. In most cases, the culprit in this situation is a standard fireplace throat damper.

Throat dampers are installed down at the bottom of the chimney, above the firebox, and are designed with a metal plate that closes off the flue when the fireplace isn’t being used. These dampers aren’t designed to seal tightly — since they’re operating with a metal plate, you can’t expect a complete, airtight seal. An airtight seal, however, is what energy-conscious homeowners want in a fireplace damper.

This desire for energy efficiency combined with the throat damper’s proneness to damage (they can rust or corrode into place, or slip off of the track they’re on), has led chimney professionals and homeowners alike to move away from throat dampers and opt for top-sealing dampers, instead. Top-sealing dampers are a vast improvement in many ways.

Top-sealing Dampers Create An Airtight Seal
Top-sealing dampers are installed at the top of the flue, and when closed, a gasket completely seals off the flue, keeping water and snow out, along with that cold air so many homeowners have complained about. We’ve seen top-sealing dampers provide significant energy savings – in fact, some figures indicate that these are as much as 90 percent more efficient than throat dampers.

Top-sealing Dampers Add Protection Against Water And Animals
Since these dampers completely close off the flue, they keep precipitation out, and block birds, squirrels, raccoons and other animals that may be looking to nest in your chimney. Top-sealing dampers also keep debris like leaves and twigs out of your chimney system, which is a big benefit, since those materials can clog the flue and create a fire hazard.

Top-sealing Dampers Aren’t As Susceptible To Corrosion
The metal plate that closes off the flue with a throat damper can rust or corrode. But since a top-sealing damper closes off the flue with a silicone rubber gasket, rust and corrosion aren’t such a concern.

Contact Blue Sky Chimney Sweeps,Today!

If your throat damper is damaged — or you’d like to take advantage of the energy savings a top-sealing damper will bring, call Blue Sky Chimney Sweeps or click here to schedule an appointment online! We’d love to improve your chimney system and “Bless Your Hearth” by installing a new top-sealing damper!


If you’re thinking about new heating appliances for your home, remember that Blue Sky Chimney Sweeps can install (and service!) wood, gas and pellet stoves, fireplaces and inserts. It’s all part of our comprehensive chimney products and installation services.

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