https://www.homedepot.com/p/UniTherm...50in/309949108
The factory just uses yellow fiberglass insulation on the fire wall with a good cover over it. The ceramic stuff is fire proof and has a higher insulation value. You can throw it in a fire to test it before you use it if you are nervous.
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"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
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