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The ceiling must be at least 41" from the fireplace opening. See Figure 3. Mantel Clearances Without Hood (Figure 4) You must have non-combustible materials above the fireplace opening. Non-combustible material must extend at least 12" above fireplace opening. With sheet metal, you must have noncombustible material behind it. Heat resistant materials such as slate and marble must be at least 1/2" thick. Sheet metal should not be installed onto combustible material. Figure 4 If your installation