Regulating Methods of Design and Installation of Warm Air Winter Air Conditioning Systems & Warm Air Heating Systems in Buildings

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(f) The return -air face, or faces, shall be made of metal. there return -air face is placed in a seat or side wall (whether furnished by owner, general contractor, or furnace contractor) the open work of face must extend to within at least 1 inch of the floor line and not more than 14 in. high. Section 9 - Smoke Pipes. (a) The smoke pipe shall be as short and direct as consistent with the location of the furnace. It shall be made of metal not lighter than No. 24 U. S. Standard Gauge, and not less than the full size of the collar on the furnace throughout its entire length. It must have no opening for attaching fireplace, stove, range, water heater, gas or ventilating connection. It shall be lock seamed or riveted; all joints shall lap not less than lz inches and it shall be rigidly secured. Cast -iron smoke pipe may be used. (b) All smoke pipes shall be provided with check dampers, placed on the side of the pipe or at the end of a tee; when cast -iron smoke pipe dampers are used they must be placed between the check damper and the furnace and supported on both sides of the pipe. (c) Where the smoke pipe enters the flue, a thimble shall be cemented into the flue and the connections thereto made air tight. Should,any smoke pipe come within 18 inches of any combustible material, such combustible material must be covered with asbestos paper and a metal shield so fastened that a 2 inch air space exists between this shield and the combustible material. This shield shall be no less in size than twice the diameter of the smoke pipe and of sufficient length to cover the combustible material at all points. (d) No smoke pipe shall project through any external wall or window. No furnace connection is to be made to a flue without a cast iron or steel cleanout having first been provided in the flue. Article b - .Pipeless Furnaces. (a) :then but one duplex grating is used for both warm air and return air in a so- called pipeless furnace, the area of the return -air intake shall be at least equal to the area of the warm -air outlet of the grating. Art. 5, Sec. 4, relative to casings shall not govern when this type of furnace is installed, but th9 following specifications shall be followed: The inner casing of this type of - 10 -