154201 254 4 X 12 4x164 X 206x126 X 146 X 168 X 148 X 1610 X i612 X 20 COLD AIR The capacity of the cold air pipes should be at least 75 per cent, of the capacityof the warm air pipes, and best results are obtained by taking cold air pipes fromthe north and west when these sides of the building are… … Circular hbterPonrunning clear aroundfhe back of furnace.IVoh eonventQfit locationof the open/nff^ £jt both.^des of Azh Door. 12 THE HECLA WARM AIR FURNACE- The radiation of Hecla Furnaces is increased by the use of steel flanges orribs fused to the iirepots, as shown above. This steel-ribbed pot…
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