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0 <br />required standard sizes of warm air and return air ducts, stacks or risers, <br />fittings, registers, and return intakes. <br />Section 2. The total heat loss for the building, in B.t.u. per hour, <br />is the sum of the room heat losses, and is used in estimating the sizes and <br />capacities of the furnaces, blowers, filters, etc. <br />Article 3 - Selection of the Furnace <br />Section 1. The Heating Plant and its component parts shall be <br />selected to satisfy the maximum hourly B.t.u. requirements of the building, <br />in accordance with the method specified in the Manual, Section B. <br />Section 2. All furnaces shall be rated in accordance with existing <br />codes and methods, recognized by the National ?:'arm Air Heating and Air Conditioning <br />Association. Ratings shall include: <br />(a) Bonnet Capacity, in B.t.u. per hour, and <br />(b) Register Delivery, in B.t.u, per hour <br />Article 4 - Selection of Ducts, Registers, <br />and Intakes <br />Section 1. The selection of branches, risers, fittings, registers, <br />intakes, and trunk ducts shall be made in accordance with the standard method, <br />outlined in the manual, Sections C through G. <br />Section 2. Insofar as conditions permit, the standard sizes of ducts, <br />fittings, registers, and intakes, shown in Sections B and F of the .anual shall <br />be used. <br />Article 5 - Construction Details <br />Section 1 - ';':all Stacks (Up to and including 14" in width.) <br />'" <br />. all stacks shall be constructed of galvanized iron sheets, 30 gauge or heavier. <br />If slip joints are used they shall be stripped with asbestos paper. ':'.There stack <br />hems, boots, or other fittings, either for warm air or return air, go through <br />first floor, all openings around such fittings shall be filled with asbestos fiber <br />or other non - combustible insulating material to make this opening dust tight. (See <br />requirements of Fire Underwriters.) <br />Section 2 - Headers Tight headers must be installed above all openings <br />for stackheads and return air intakes. (see requirements of Fire Underwriters.) <br />- 2 - <br />