Fireplace Mantel Clearance Diagram. The national fire code requires all combustible material to be at least 6 inches from the opening of the firebox. Not sure how much clearance you need?
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Fireplaces, mantels & hearth products.
I really needed to build a fireplace surround for an electric fireplace. Determine the size of the mantel. Fireplaces, mantels & hearth products. The clearances listed below are minimum distances unless otherwise stated (refer to diagrams on page 8):
