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Lock Top Chimney Damper

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The Lock-Top Damper seals out pests and weather problems with its quality built, rigid construction. It is a low cost solution to replace throat dampers to help prevent heat and air conditioning loss from your home. Installation Instructions included.

Damper includes 30' cable, adhesive, and mounting hardware. Lifetime warranty. Note: Do not use Lock-Top dampers with gas logs. Intended for use with traditional masonry wood burning fireplaces.

Make the removing of the damper quick and easy for chimney cleaning and inspection by adding a Sweep's Ring Metal Gasket. The Sweep's Ring Gasket will attach to the flue with the adhesive (included with damper) and the damper will simply bolt to the gasket. Check the option box above to add this to your damper.


Size Fits Inside Flue Sizes
8" x 8" 6" to 9" Width x 6" to 9" Length
8" x 13" 6" to 9 1/2" Width x 9" to 12 1/2" Length
8" x 17" 6" to 9" Width x 14" to 17 1/2" Length
13" x 13" 9" to 12 1/2" Width x 9" to 12 1/2" Length
13" x 17" 9" to 12 1/2" Width x 14" to 17 1/2" Length
17" x 17" 14" to 17 1/2" Width x 14" to 17 1/2" Length

RS Round Flue Adapter (Optional):

Lock-Top Dampers are installed to your chimney flue, many of the flues are rectangle or square in shape and the dampers are easily attached to the chimney or clay tiles. However, many chimney flues have round clay tiles, pipes or solid packed Class A double wall pipes, we now have a solution for them - the RS round flue adapter.

Using the RS Adapter, simply slide it inside the round flue opening and attach the energy-saving Lock-Top damper to the square (top) of the RS adapter. Select the RS Adapter by the inside diameter of the flue or pipe opening. The RS adapters are NOT to be used with Air Cooled Pipes. Please contact us for a quote for Air Cooled Pipe Adapters. Give us a call, if you would like help sizing for a RS Adapter

RS Round Flue Adapter Sizing:

Size Lock-Top Required RS Adapter Size (fits inside dimension of pipe) RS Plate Size
8" x 8" 6" Adapter 9 1/2" x 9 1/2"
8" x 8" 7" Adapter 9 1/2" x 9 1/2"
8" x 8" 8" Adapter 9 1/2" x 9 1/2"
13" x 13" 9" Adapter 12 1/2" x 12 1/2"
13" x 13" 10" Adapter 12 1/2" x 12 1/2"
13" x 13" 11" Adapter 12 1/2" x 12 1/2"
13" x 13" 12" Adapter 12 1/2" x 12 1/2"

Installation & Operating Instructions:

How to Install a Lock Top Chimney Damper
Operating Instructions for the Lock Top Chimney Damper

Warranty Information:

The manufacturer, warrants for the purchaser's lifetime that our energy-saving fireplace dampers, when reasonably maintained and used on solid fuel burning chimneys, shall be free from any defects in materials and workmanship. To make a claim under this warranty, contact the professional who sold it to you. Upon approval of your claim, the manufacturer will replace the damper to the professional as your exclusive remedy. The manufacturer will not be liable for any incidental or consequential damages.