Doors for a propane forge. Please - Gas Forges - I Forge Iron

I working on a gas forge out of propane tanks. Things are real close. I am wondering about Doors. 1, If I use metal for doors I'll have to cover them with that Unifrax blanket, RIGHT 2, If I use fire brick how would I do the doors ? I have seen pix around here, but can't seem to find them. Any id

VEVOR Propane Forge Portable, Double Burner Tool and Knife Making

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