Top-Mount Dampers

Certified Sweepers

Sweep Masters

At MN Stoneworks, we believe that quality is a fundamental element in maintaining customer satisfaction.

Our mission is to deliver the best possible product, which is why our team of experts rigorously inspects all of our products before they’re delivered, ensuring the best quality, often surpassing industry standards.


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MN Stoneworks

Top-Mount Dampers

Top-Mount Dampers

Choosing The Right One For Your Chimney Is Essential

Top mount dampers, also called top-sealing dampers, are often used as replacements for leaky throat dampers. A top mount damper provide four season protection for your chimney. When closed, it serves as a chimney cap and the silicone rubber gasket provides a more air-tight seal than a metal-to-metal throat damper to seal in heat and air conditioning, and to seal out birds, animals, insects and debris. Some models come with caps so even when the damper is open, it still protects the chimney from birds, animals, insects and debris. Top mount dampers open and close by means of a cable dropped down the chimney to an easily accessible handle that mounts to the inside of the firebox. See Demo (Shown: Lock-Top Damper). Our personal favorite is the Lock-Top II top mounted fireplace damper with cap, but we also offer several other different brands and styles to choose from.

Note: These dampers are specifically designed for woodburning masonry fireplace flues and should not be used on flues servicing wood or coal stoves or on fireplaces with gas logs.


Lock-Top Chimney Damper

Help yourself slam the door on soaring energy costs. The Lock-Top Damper makes a super tight seal with its silicone rubber gasket. This tight seal can reduce heat loss by 90 percent over even new traditional throat dampers. Traditional throat dampers have a metal-to-metal seal. They’re leaky even when new and only get worse as they rust and warp with age. The Lock-Top has a stainless steel lid attached to a cast-aluminum frame by an array of stainless spring wires. It is operated by a 30′ cable dropped down the chimney with a handle mounted in the firebox. Just a tug on the handle will open or tightly close the Lock-Top.


Lock-Top II Chimney Cap / Damper

The Lock-Top II combines the energy-saving features of the Lock-Top Damper with a special stainless steel Gelco chimney cap. The Lock-Top II comes fully assembled. The base mounts to the a sweep’s ring which attaches to the flue with silicone sealant. A 30′ stainless steel cable drops down the flue, and a hardware set mounts in the firebox. The Lock-Top II has a lifetime warranty and is available in 3/4″ and 5/8″ mesh.


Lyemance Top-Sealing Damper

A Lyemance Top-Sealing Damper is a superbly constructed and engineered damper that eliminates 90% of the winter heat and summer cooling loss that leaks past your current throat damper. It also eliminates downdrafts and keeps moisture and animals out of your chimney and home. Moisture in your chimney causes unwelcome odors and leads to deterioration of bricks and mortar. The Lyemance Top-Sealing Damper works year round to protect your chimney. The silicone rubber gasket provides solid, tight-sealing protection to the top of the flue. Traditional throat dampers only give metal to metal contact and are notoriously leaky and expensive. The lyemance damper is operated by a 35′ cable dropped down the chimney with a handle mounted in
the firebox. Just a tug on the handle will open or tightly close the Lyemance


Lyemance “OPC” Damper with Cap

The Lyemance “OPC” (Original Plus Cap) damper/cap combo is a super unit that gives you all the energy-savings benefits of an original Lyemance Damper plus a chimney cap. The cast aluminum “OPC” has 3/4″ aluminum mesh. It features a Lifetime Warranty and comes with a 32′ cable, the Power Lever, and all necessary hardware.