What is the minimum clearance for a combustible mantel OVER a fireplace opening?

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Multiple Choice

What is the minimum clearance for a combustible mantel OVER a fireplace opening?

Explanation:
Radiant heat from a fireplace can raise the temperature of nearby materials, so a combustible mantel needs a safe gap above the fireplace opening. The smallest distance allowed for a combustible mantel is 12 inches. This clearance reduces the risk of the wood catching fire during normal operation. Placing the mantel closer (4 or 6 inches) would be unsafe, while more space (18 inches) is safer but exceeds the minimum.

Radiant heat from a fireplace can raise the temperature of nearby materials, so a combustible mantel needs a safe gap above the fireplace opening. The smallest distance allowed for a combustible mantel is 12 inches. This clearance reduces the risk of the wood catching fire during normal operation. Placing the mantel closer (4 or 6 inches) would be unsafe, while more space (18 inches) is safer but exceeds the minimum.

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