§ 3131.14 Ash Pits
   (a)   Ash pits and ash receptacles shall be of masonry, metal or other approved noncombustible material.
   (b)   Ash pits or rooms constructed for the storage or handling of large quantities of ashes within buildings or other structures shall be of Type 1A, 1B or 2A construction. Any doors provided shall be of metal in metal frames.