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Insulation in contact with metal firebox

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That looks pretty cheesy!

I can't give you an insight to your specific observation. But, as a mason I used to install metal pre-fab units called "Heatilators" which actually came with a blanket of fiberglass insulation to be installed around the unit. The intent was two-fold. 1. Insulation 2. To keep the masonry away from the metal to allow expansion and contraction.

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It's glass. It can't burn and it won't melt until it's melting temperature is reached, which is probably not likely with a gas fireplace insert. However, if it's insulation made with urea formaldehyde I have no idea what the ramifications of heating that stuff up are.



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