Metal Exposed to the Interior

(1)  Metal exposed to the interior of a fireplace such as the damper control mechanism shall have at least a 50 mm clearance from any combustible material on the face of the fireplace where such metal penetrates through the face of the fireplace.

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Article 9.22.9.2 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.