
Minimum Clearances For Side Combustible Material, Side Wall, and Ceiling A. Clearances from the side of the fireplace cabinet to any combustible material and wall should follow the diagram in Figure 4. Example:The face of a mantel, bookshelf, etc. is made of combustible material and protrudes 3 1/2" from the wall. This combustible material must be 4" from the side of the fireplace opening (see Figure 4). Note: When installing your gas logs into a manufactured firebox, follow firebox manufacturer