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Fireplace Smoke Guards

Wood fireplaces produce smoke as a matter of course, and these smoke guards can help to keep smoke out of your room and headed up the chimney where it belongs. Guards install quite simply in the top of the fireplace opening. A variety of widths are available to match the size of your fireplace and you have several beautiful decorative finishes to choose from so that you can decide how best to complement your decor.
Ask & Answer
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By Nelson from Fairfax VA on April 20, 2013
How do I install a 4" smoke guard with a glass door fireplace?
By Collin C. - NFI Master Hearth Professional on April 22, 2013

In most cases, there will be enough of a brick ledge behind the doors to allow the guard to be anchored. However, you will likely need to remove the door surround in order to mount the smoke guard. Removing the doors will allow access to either side of the surround and will provide the ability to anchor the shelf into position. You can then re-install the door assembly.

By Joe from NJ on November 19, 2014
Do you carry smoke guards for wood stove inserts?
By eFireplaceStore on November 19, 2014

Unfortunately, no. Wood stove inserts are typically operated with the doors closed, so smoke guards for them are not very common. I apologize for the inconvenience.

By Thalia from Seattle, WA on April 9, 2015
What is your recommendation for figuring out the correct size of the fireplace smoke guard? I am trying to decide between the 6 inch and 8 inch.
By eFireplaceStore on April 9, 2015

Ideally, your fireplace opening will be a 10 to 1 ratio for ideal draft, meaning that for every 10 square inches of fireplace opening, there will be 1 square inch of flue. You will need to figure the total area of the fireplace opening and know the area of your flue tiles in order to verify which shelf will bring you closer to the 10 to 1 ratio. If you are unable to measure your flue tiles, there is a test that can be performed with a piece of plywood or scrap metal. Using a piece that is as wide as your fireplace and 8 inches tall, build a fire and bring the fireplace up to temperature. Hold the piece of wood or metal so that the top 6 inches of the fireplace is covered. If the fireplace stops smoking, the 6 inch smoke guard will work. If you must drop the piece to 8 inches to stop the smoking, the larger shelf will be needed.

By Linda from San Francisco, CA on November 13, 2014
How do I determine the size of smoke guard that I will need for my fireplace?
By eFireplaceStore on November 14, 2014

The size of the smoke guard needed will depend on which model brings your chimney opening to flue ratio closest to the standard 10:1. For every 10 square inches of fireplace opening that you have, you should have 1 square inch of flue opening. After measuring your chimney tiles, calculate the area. For example, a 7 x 11 flue tile will have an area of 77 square inches. Per the 10:1 rule, this would put the appropriate fireplace opening at 770 square inches. The sizing does not have to be perfect, but if it is over or under the 10:1 ratio by more than 50 square inches, draft issues will result.

By Dave from Westhaven, CT on December 22, 2013
How do I know what size smoke guard I need? Should it be 4-6 or eight inch? Or, should I make the width smaller? Where do I start?
By Collin C. - NFI Master Hearth Professional on December 23, 2013

The size of the smokeguard that is needed will depend on the size of your fireplace opening and the size of the chimney flue. The fireplace opening and flue should have a 10 to 1 ratio to one another. Meaning, for every 10 square inches of fireplace opening, there should be 1 square inch of flue size. Based on that math, you should figure exactly how much the opening will be sized down using each guard.

By Dave from Manistee, MI on September 15, 2014
What if, behind the screen and doors, the fire place fire brick and melt were angled inward by about 45 degrees? Will the spring still hold?

By eFireplaceStore on September 16, 2014

Unfortunately, this product relies on at least the first course of brick depth being perfectly flat for the springs to hold properly. If there is any taper, a pair of custom mounting brackets would need to be made to hold the guard in place.

By Cate from Charlotte, NC on September 18, 2013
How do I decide which width of smoke guard I need to purchase?
By Collin C. - NFI Master Hearth Professional on September 19, 2013

Ideally, your fireplace will have a 10 to 1 opening to flue ratio. That is to say, your fireplace flue will have 1 square inch of area to every 10 square inches of opening size. If you know the size of your flue, you can use that to determine how big your opening would need to be to get to that 10 to 1 ratio. You can then determine which size smoke shelf would size down your opening to get to that correct ratio.

By Cate from NC on February 14, 2015
My fireplace opening is 42" Wide by 29.5" High. How do I decide if I need a 4" or 6" smoke guard?
By eFireplaceStore on February 16, 2015

The size of the smoke guard will depend on the size of your flue tiles that are venting the fireplace. Ideally, your fireplace will have a 10:1 opening to flue ratio, meaning for every 10 square inches of fireplace opening, there will be 1 square inch of flue opening. The dimensions of your chimney flue will need to be known in order to figure which smoke guard is needed.

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