Lock Top II Chimney Damper

Product Images

Lock Top II Chimney Damper

Lock Top II Chimney Damper

Lock Top II Chimney Damper

Lock Top II Chimney Damper

Optional RS Adapter

Optional RS Adapter

Lock Top II Chimney Damper

Lock Top II Chimney Damper

Mesh Options

Mesh Options

Fire Cutoff

Fire Cutoff

8x8 Lock Top II Chimney Damper

8x8 Lock Top II Chimney Damper

8x13 Lock Top II Chimney Damper

8x13 Lock Top II Chimney Damper

13x13 Lock Top II Chimney Damper

13x13 Lock Top II Chimney Damper

13x17 Lock Top II Chimney Damper

13x17 Lock Top II Chimney Damper

17x17 Lock Top II Chimney Damper

17x17 Lock Top II Chimney Damper

8x17 Lock Top II Chimney Damper

8x17 Lock Top II Chimney Damper

Description:
The Lock-Top II damper has a specially designed chimney cap. It comes fully assembled and ready to install directly to...

The Lock-Top II damper has a specially designed chimney cap. It comes fully assembled and ready to install directly to the flue tile. Includes Sweep's Ring to make removing the damper quick and easy!

As low as$465.99

Product Details:

The Lock Top II Chimney Damper With Cap is the perfect solution for cold & drafty wood burning fireplaces. There's no question, old traditional metal fireplace throat dampers tend to be very leaky even when the damper is closed.

Save money by installing the Lock Top Chimney Damper. As a matter of fact, a traditional masonry fireplace throat damper will leak $200 or more of energy a year. However, the Lock Top II Chimney Damper is equipped with a silicone gasket under the lid which makes for an extremely tight seal when closed. After installation, you will no longer feel a draft when the fireplace is not being used.

Features

Not only will this damper prevent downdrafts and energy loss, it is also equipped with a single flue chimney cap with 3/4" spark arrestor to prevent sparks from exiting the chimney while also providing weather protection. The cap will also prevent critters from entering the chimney if you forget to close the damper after you have had a fire. The cap is removable from the damper for cleaning and maintenance.

A Sweep's Ring is included with the Lock Top II Damper Cap. Specifically, the Sweep's Ring allows you to fully remove the damper without having to cut the adhesive that holds the damper to the flue. The Sweep's Ring Gasket will attach to the flue with the included adhesive.  Lastly, the damper will bolt to the Sweep's Ring gasket.

Moreover, the Lock Top II Chimney Damper includes 30 ft. cable, adhesive, mounting hardware, and a Lifetime Warranty. The heavy duty stainless steel cable withstands extreme temperatures, it will not burn out. The base is constructed of heavy duty cast aluminum and the lid from stainless steel.

Overall, the hardware you will need to install the Lock Top II Damper is included. For that reason, the only tools you will need to install the damper are a pair of wire cutters, drill, 1/4" masonry drill bit, and a hammer.

  • Removable lid
  • 3/4" spark arrestor
  • 30 ft. stainless steel cable
  • Mounting hardware
  • Sweep's Ring
  • Adhesive
  • Lifetime Warranty

Operating Your Lock Top Chimney Damper

Firstly, mount the Lock Top II Chimney Damper on the top of your chimney flue. Secondly, adjust the chain handle to the bracket you mount on the fireplace wall. Lastly, lock the cable in the fireplace bracket when you want to close the damper and release the cable from the bracket to allow the damper to spring open when you are ready to have a fire. 

Most important, this is intended for use with traditional masonry wood burning fireplaces. In addition, do not use with gas appliances or gas logs.

Note: Do not use Lock-Top II dampers with gas logs (failure to open the damper for gas burning appliances could result in carbon monoxide to back up in the home. Also, in the event of a gas leak, could result in gas being trapped in the chimney which could result in an explosion.)

Lock Top Chimney Damper Sizing:

Firstly, measure the inside of the masonry chimney opening or clay flue. Secondly, compare your measurements to the chart below to find the damper size that will fit.

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

Options for Your Lock Top Chimney Damper

RS Round Flue Adapter (Optional):

Although Lock-Top Dampers are typically installed to your square or rectangle flue, many chimney flues have round clay tiles, pipes, or solid packed Class A double wall pipes. We now have a solution for them with the RS round flue adapter.

Firstly, use the RS Round Adapter by simply sliding it inside the round flue opening. Secondly, you will attach the energy-saving Lock-Top damper to the square (top) of the RS adapter.

RS Round Flue Adapter Sizing:

To begin with, select the RS Adapter by the inside diameter of the flue or pipe opening. Another key point, the RS adapters are NOT to be used with Air Cooled Pipes. If you need an Air Cooled Adapter, please contact us for a quote.

Nevertheless, give us a call if you would like help sizing for a RS Adapter.

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"

Help & Documents:

Installation Instructions:

Lock Top II Chimney Damper Installation Instructional Video

Note: In order for the damper to close properly the cable must be inside the indented bar that holds the fusible link together. If the cable is outside the indented bar of the fusible link, the damper will not close properly. See the example above on the thumbnail slider.

Reviews:

Customer Reviews

Based on 10 reviews
90%
(9)
10%
(1)
0%
(0)
0%
(0)
0%
(0)
J
James
Great Product

I installed the damper and the pull cable in 15 minutes. I was very happy with product,

H
HH
Great for real winter

Internal damper rusted out in cold, snowy country. This one seals the drafts much better and survived the deep snow. Keeps the birds out, too.

K
Ken
Awesome product

Solved a problem I had with an internal damper rusting out like swiss cheese. This thing installed on the chimney in minutes and then another 20 minutes to install the pull cable. I recommend this to anyone. The nice part is, it comes with the clean ring so I can unbolt it and take it off for chimney cleaning.

T
Ty M
Great Product

Works well, easy install, quick ship. Great customer service.

D
Drew
Easy to install, works great

It was easy to install and works great.



We had a noticeable backdraft on warm days that caused a noticeable smoke smell in the house. The Lock top II has eliminated this problem.

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Our 316Ti flexible chimney liner and chimney liner components have passed the rigorous testing at the Underwriters Laboratories with best in class status and are UL Listed. So if you are looking for UL listed chimney liner sold directly to homeowners, then look no further than Rockford Chimney

Customer Testimonials

Back in July you gave me excellent advice re. sizing/purchasing a flue liner for the chimney associated with my wood stove. I'd like to thank you once agai... More

—AE Northfield, MN

A few weeks ago I ordered a chimney liner system for my fireplace insert. Your salesman recommended the liner system plus the insulating blanket. I just wa... More

—AH Happy customer

Just got around to installing my new smooth flexible liner and deluxe terra cotta cap (wow). The quality of your product is second to none. Very pleased an... More

—B.B. from Massachusetts

Thanks so much for the great tech service from Dennis, very knowledgable, friendly and proffessional.Your website is the best, beats your competition by fa... More

—Bill in Knoxville

Sue and Dennis, I received the final part of my order yesterday (the chimney cap that actually fits over the chimney chase). It looks wonderfu... More

—CC, VA

Hello, I was shopping for an fireplace insert and called RCS to ask why they were so much cheaper than my local guy, the reply was " we sell thousand of th... More

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