(a) Every furnace installed in any building, other than a one-family dwelling, shall be enclosed and separated from the rest of the building by walls, partitions, floors and ceilings of noncombustible construction or of one-hour fire-resistance construction. Buildings having a capacity, for their particular use, of more than 75 persons or of assembly occupancy, shall have their furnace(s) separated from the rest of the building by wall, partition, floor and ceiling construction having a fire-resistance rating of not less than two hours, or as required below. In no case shall the enclosing construction be located within two and one-half feet of the furnace on the rear and sides, and four feet in the front.
(b) The surfaces of combustible materials less than 30 inches above a furnace shall be covered with not less than No. 24 U.S. gauge sheet metal, whose edges shall be extended not less than 12 inches beyond the top of the heating unit.
(c) Every boiler carrying more than 15 pounds per square inch pressure, with a rating in excess of ten boiler horsepower, shall be installed in a separate room or compartment and separated from the rest of the building by walls and partitions having at least a two-hour fire-resistance rating and by floor and ceiling construction having not less than a two and one-half hour fire rating.
(Ord. 1963-52, passed 5-6-1963)