Up to 8% of home heating costs can exit through a fireplace chimney with an open or damaged damper. A tight fitting, gasketed chimney damper will help stop heat loss. It's like replacing old leaky storm windows with a tight-sealing energy-efficient window.

You'll save money and stay warmer!

Additionally, weather related damages to chimneys cost home owners millions of dollars every year. A chimney without a cap allows rain and snow to be absorbed into your chimney's inner flue tile, outer bricks and mortar. Freeze/thaw cycles will compromise the integrity of the structure; mortar loosens and bricks will eventually be dislodged. Sometimes the front facing of the bricks will pop off. Top mount fireplace dampers also act as a chimney cap to keep birds, animals and even insects out of your chimney.



See both styles of top mount dampers:



The SEAL TIGHT damper is a low-profile top mounted damper that also serves as a chimney cap. This makes it ideal for historic homes where a chimney cap might affect its aesthetic appeal.

Heat loss up the fireplace chimney accounts for an average 8% of your home heating costs! Seal Tight Dampers help prevent this heat loss. Stay warmer and save money!

  • Four season protection for your chimney. When closed, the damper seals out birds, animals, insects and seals in your heat and air conditioning.
  • Serves as a chimney cap when closed
  • Replaces leaky throat dampers
  • Includes two types of gasket making it superior to similar style dampers
  • Easily accessible handle mounts inside of fireplace
  • Precision engineered mechanism is easier to open and close than throat dampers
  • The practical solution to upgrading fireplace chimneys in older houses that never had a damper installed previously
  • Constructed of stainless steel and aluminum so components will not rust or corrode.
  • Low Profile Design makes these dampers virtually invisible from the ground.
  • Defaults to open position for maximum safety
  • Lifetime Warranty


The SEAL TIGHT damper attaches to the top of the flue tile on fireplace chimneys. Our models are sized by common flue tiles and available in 7 Sizes:

Minimum Outer Dimension of Flue Tile
Maximum Outer Dimension of Flue Tile
8 " x 8"
6-3/4" x 6-3/4"
9" x 9"
8" x 17"
6-1/4" x 14-1/2"
8-3/4" x 16-3/4"
9" x 13"
6-1/2" x 10-1/2"
9" x 12-3/4"
12" x 16"
9-1/4" x 13"
11-3/4" x 15-1/2"
13" x 13"
10-1/8" x 10-1/8"
12-3/4" x 12-3/4"
13" x 18"
9-5/8" x 15"
12-3/4" x 17-1/2"
18" x 18"
15" x 15"
17-3/4" x 17-3/4"

Each damper kit includes:

  • 30' cable which can be cut to adjust for perfect fit
  • Fireplace bracket and cool-touch spring handle
  • Mounting adhesive and hardware

Optional Accessories:

  • 50' cable for taller chimneys

SEAL TIGHT Dampers are made for use only with open woodburning masonry fireplace chimneys and are NOT suitable for use in the following types of installations:

  • Don't use on chimneys serving vented gas logs. Vented gas logs require the fireplace damper to be removed completely or fixed to a permanently open position; this is to assure that soot, fumes and carbon monoxide do not enter your home.
  • Use only on vent-free gas logs if approved by the appliance manufacturer and the local authority having jurisdiction. However, we don't recommend it because the moisture generated from the gas logs could damage the chimney structure.
  • Don't use on chimneys serving other fuels, wood stoves or other appliances such as inserts, furnaces, etc.


SEAL TIGHT Dampers can be installed by homeowners who feel comfortable working on a roof, but U.S. Fireplace Products, Inc. strongly recommends you use the services of a qualified chimney sweep who can also inspect your chimney and provide other valuable home safety services.