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I have a dilemma with sizing my gas fireplace box to fit a new glass door.

The firebox is 40-in W x 23-in H

Medium glass door: 30-37-Inch width of firebox opening and 22.5-32.5-Inch height of firebox opening, with 37.5-33-Inch overall frame dimensions.

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Large glass door: 36-43-Inch width of firebox opening and 25.5-32.5-Inch height of firebox opening, with 43.5-33-Inch overall frame dimensions.

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So look like my firebox width is OK for Medium but the height of 40-in is higher than the Medium. Is that OK?

Or should I pick Large where both width and height is larger than my current firebox?

What is safe?

Thanks.

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  • Is yours a prefabricated/factory-built fireplace or is it masonry?
    – auujay
    Commented Jan 7, 2019 at 13:14

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If adding a door kit I would want the frame to be at least 1/2" wider than the opening so it can be sealed with insulation. I use rock wool for the seal because it holds up to the heat.

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  • If that is the case, Large should work for me. But why they put "25.5-32.5-Inch height" range and not just say something like "max height of 32.5 in"? The number 25.5-in is throwing me off as it's larger than mine which is 23-in
    – HP.
    Commented Jan 8, 2019 at 5:51

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