How much larger than the fireplace opening should a door kit be

fireplaceremodeling

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.

Best Answer

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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