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    Fireplace Chimney Dampers, Parts, and Accessories

    Your fireplace brings warmth and beauty to your home, but what you and many others may not realize is that your fireplace chimney can cause some major energy inefficiency in your home. That is why chimney dampers are so essential. Chimney dampers are an often overlooked device allow you to close off your chimney flue when your fireplace is not in use, which keeps the heat, and even air-conditioned air, from escaping up the chimney. One of our top sellers is the Vestal Cast Iron Fireplace Damper Plate, whose rotary styled controls are easily controlled and operated by one of your fireplace pokers. Your chimney damper is installed by simply sliding it into place. This particular model is for a standard 36-inch flue.
    Ask & Answer
    Ask a Specialist
    16 Questions & 17 Answers
    Kevin O
    from Chicago IL asked:
    January 1, 2018
    I read that a lock top damper should not be used in gas log fireplaces. Why? Is that a requirement or a recommendation?
    1 Answer
    This is because a damper should never be used with a gas log set, as the house will fill with carbon monoxide if the set is turned on but the damper is accidentally left shut. All vented log sets come with a damper clamp to make sure that any operational damper is left open at all times.
    Brennan W.
    on January 2, 2018

    from Estes Park, CO asked:
    January 17, 2017
    What prevents the Chimney Dampers from freezing shut?
    2 Answers
    Please allow me to look into this for you. We will be in touch shortly.
    Brennan W.
    on January 17, 2017
    One disadvantage of a top mounted chimney damper is the possibility of it freezing shut during the winter. Some models have a special mechanism that helps break the ice and dislodge a frozen damper. Our Chimney Cap and Damper combos are made with the lip designed to keep water from pooling on top of your damper and lowering the risk of it freezing shut.
    Kelsey C.
    on January 17, 2017

    R & R
    from New Jersey asked:
    December 19, 2016
    I am looking for a replacement damper plate 35'' x7'' (right side handle).
    1 Answer
    The damper plates we offer are replacement plates for the full Vestal damper assemblies we also offer and will not have the same specifications as your existing damper.
    Will M.
    on December 20, 2016

    Marne Thompson
    from Statesboro, GA asked:
    December 14, 2016
    I removed a Buck Stove insert from my masonry fireplace. When this was removed it left an open "hole" for air to pass in and out of the chimney. How do I know if I need a damper or just a damper plate? The insert was in the fireplace when I purchased the house.
    1 Answer
    If the cast iron damper framework is already there, you would simply measure the opening of the damper assembly. We only offer replacement damper plates for the Vestal dampers we offer here, so there would be no way to ensure the plates we offer would be correct.
    Will M.
    on December 15, 2016

    Phillip D. Cain
    from Aiken, South Carolina asked:
    December 13, 2016
    I am in need of replacement throat damper for brick fireplace. The opening is 33.5" x 6". The location of the damper hinges has rusted.
    1 Answer
    If the actual damper frame is rusted out, it may be a good idea to simply replace the entire damper assembly. You may be able to use the Vestal Cast Iron Fireplace Damper Plate - For 42 Inch Dampers as a quick fix, but this is made to fit only the 42" Vestal damper assembly we also offer so it likely will not provide a snug fit.
    Will M.
    on December 13, 2016

    from Jacksonville, FL asked:
    December 12, 2016
    I have a home from the mid 1940's, and would like to add a top mount damper to the flue. The flue appears to be constructed of rectangular, verified clay. The dimensions are 15-3/8" inside to inside length (17" outside to outside length) and 6-3/4 inside to inside width (8-3/8 outside to outside width). Do you have a model that fits this arrangement?
    1 Answer
    The Lock-Top 8 in. x 17 in. Energy-Saving Chimney Damper would indeed work with these measurements.
    Will M.
    on December 13, 2016

    from kensington, NH asked:
    November 8, 2016
    We have a missing damper plate in our fireplace. The actual opening measures 28 and 13/16" x 5 3/4". I assume we'd need something a bit longer on both measures, right? Do you have a replacement plate that might fit?
    1 Answer
    The Vestal Cast Iron Fireplace Damper Plate - For 36 Inch Dampers measures 7" D x 28 3/8" W, but please note that this product is a replacement damper plate for Vestal dampers and may not fit properly with your damper.
    Will M.
    on November 8, 2016

    from Adams, MA asked:
    October 30, 2016
    I would like to control the damper from outside of the fireplace with a crank type of system, including a chain to pull down to close and open the top of the chimney cap. I need to pull down from inside of the firebox or fireplace. Is there a product out there for this application?
    1 Answer
    Unfortunately, I do not have access to a crank style damper system like the one you seek.
    Brennan W.
    on October 31, 2016

    from Louisville, KY asked:
    November 11, 2014
    I just bought a house with a decorative gas fireplace that has a 6 inch metal vent. It does not have any type of damper on it and when the wind blows it comes into the room. Is there something I can have installed to stop the air infiltration or do I just need to plug the vent and not light the fireplace? It is a Majco model GBU36 fireplace.
    1 Answer
    Unfortunately, many of the older B vent gas fireplaces suffered from this issue. There is a built in draft diverter that is supposed to cure the issue, but it is not entirely effective. A high wind cap can be added to the vent system or a custom draft diverter fitted over the cap, but if you do not plan on using the unit, you could indeed pack insulation into the vent opening. If you go that route, it will need to be made known to anyone who may try to burn the unit in the future.
    on November 11, 2014

    from Philadelphia, PA asked:
    August 19, 2014
    How do you determine what size damper you need? Can a novice replace the handle?
    1 Answer
    The damper throat should be sized to the width of the fireplace opening. If the opening is sized between the castings available, it should be sized to the closest casting step. The handle itself is usually simple to replace. Most models simply have a drive pin holding the handle in place, but it differs from design to design.
    on August 19, 2014

    from Natchez, MS asked:
    July 16, 2014
    Looking for a replacement damper plate. I do not have the old plate. The measurements inside the opening are 4 1/4" x 35 1/2".
    1 Answer
    We do carry replacement damper plates, but they are specific to the Vestal brand of dampers and as such, we do not have one that matches your size requirements. The plates we carry are not easily modified, as they are cast from grey iron. If you are not able to see a name on the damper throat, the best option would be to have a damper plate cut from 1/4 inch plate steel that matches your sizing requirements. The only other option would be to remove the entire damper throat and replace the assembly with a new one.
    on July 17, 2014

    from Southeast Michigan asked:
    July 3, 2014
    I am renovating a house that has two fireplaces, but both lack dampers. Do you have, or can you recommend, a guide for the builder/owner on how to size and install dampers?
    1 Answer
    As a standard, the damper throat should be the same size as the front width of the fireplace opening. As such, a Vestal 36 Inch Cast Iron Throat-Style Fireplace Damper would be the proper size to use for a 36 inch fireplace. Most damper assemblies are held in position with a layer of parging mix. If you have an existing damper that has rusted badly or otherwise needs replacement, it will need to be removed by using a cold chisel and hammer to break the existing parging mix loose. After removing the existing damper and any remaining mortar, the new assembly can be put into position and new parging mix used to secure it. If the new damper does not sit upon a brick ledge, you may need to construct temporary 2 x 4 supports to hold the damper assembly in position while the parging mix sets. A good parging mix to use is the Ahrens Chamber-Tech 2000 Smoke Chamber Parging Mix.
    on July 3, 2014

    from Leesburg OH asked:
    January 20, 2013
    I have a vestal damper but I am missing the piece that hangs and catches the poker style piece. Can I just buy one of those?
    1 Answer
    Vestal does not offer the poker catch as an individual piece at this time. The catch is only sold in conjunction with the replacement poker arm, seen here. I apologize that we do not have this item individually.
    Collin C. - NFI Master Hearth Professional
    on January 21, 2013

    from Atlanta asked:
    December 31, 2012
    I have a brick fireplace with no damper. The clay flue is in good condition and I was thinking of getting a chimney cap and bottom damper. I don't think I can use one of the top dampers because I don't have any of the clay flue extending above the top of the chimney, and the furnace uses a separate flue in the chimney to vent, so I can't block that. The flue is 11" x 7" but I can't seem to find a damper that would work.
    1 Answer
    It is likely that none of our dampers would be small enough for you, unless your fireplace throat is quite a bit bigger than your flue size. Please see the Vestal 24 Inch Cast Iron Throat-Style Fireplace Damper.
    Tyler M. - Fireplace Specialist
    on January 2, 2013

    from New York asked:
    December 6, 2012
    I have a fireplace damper that looks identical to the Vestal models I see on your site, even though it is at least 50 years old. I want to install a wood burning insert with a 6-inch liner opening. Even with the damper plate "open" it looks like only 5 inches is available. I think if I just completely remove the damper plate the cylindrical 6-inch liner might make it through the damper opening without forcing it into too much of an "oval" shape. However, I can't find how the plate can be removed. In the photos it seems to have two tabs. Is it just a matter of lifting the plate up so the tabs come out, or are there screws or bolts to contend with. Also, is the whole damper unit (frame and plate together) secured with bolts or mortar?
    1 Answer
    On the Vestal damper models we sell, the damper plate is held in position by a pair of mounting pins. The pins are driven into position through the welded bushings and can be knocked out of place by using a punch or chisel. Some older damper plates simply have the plate resting on an open hinge and the plate can simply be lifted out of position. Generally, the entire damper throat is only held in position with parging. This can usually be chipped away and will allow the throat to be removed if necessary.
    Collin C. - NFI Master Hearth Professional
    on December 7, 2012

    from New Kensington, PA asked:
    November 5, 2012
    I needed to have my fireplace damper plate removed to get baby raccoon out of the chimney. Now, I have a roughly 24" X 4" opening into the chimney above my ventless gas logs in which I want to put a loose, unsecured replacement plate. There is room above this opening to slide a plate that is somewhat larger than the opening and that plate could then rest on bricks and effectively close the area. The top of the chimney is now (since the raccoon) capped but dirt and water sometimes get in and damage my gas logs. Do you have a plate that I can buy to slide into and fill this opening? There would be no need to open or close the plate once it rests in place.
    1 Answer
    Unfortunately, we do not work with a manufacturer that supplies such an item. It is common to used rolled, unfaced fiberglass insulation to seal around any liner that passes through the damper area. However, a block-off plate would need to be fabricated on site.
    Tyler M. - Fireplace Specialist
    on November 6, 2012 has several different options for chimney dampers, such as plate style or throat style, but we also have many accessories and fireplace damper replacement parts. We have several types of draft guard fireplace covers, chimney flue damper and stops, and damper caps. Damper pulls are another needed accessory. has simple wrought iron pulls as well as ones that are more fashionable, such as the Woodfield Solid Brass Damper Pull, which has helpful open and close markings on the appropriate sides. If you have an iron stove, has dampers and damper parts for you as well. is a one-stop option for all your fireplace needs, and they have amazing costumer service. All of our fireplace dampers come with free shipping, and if you have any questions at all, you can ask one of our experienced specialists for a free consultation or read through one of our many information guides. Chimney dampers are an often missed but essential accessory to your in-home fireplace or wood stove. Let help you increase your home's energy efficiency and your fireplace's longevity.
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