American Society of Heating and Ventilating Engineers Guide, 1937~~~ the air stream must change direction or shape, streamline fittings should be employed^ Horizontal ducts should pitch at least V> in. ner f,w upward from the furnace. 1 The recirculating grilles (or registers) should have a free area at least equal to the ducts to which they connect,, and their free area should never be less than 50 per cent of their gross area.

American Society of Heating and Ventilating Engineers Guide, 1937 established by Babcock in formula 1. or (1) where P = loss in pressure, pounds per square inch. d = inside diameter of pipe, inches.

American Society of Heating and Ventilating Engineers Guide, 1937 Table 4.

w American Society of Heating and Ventilating Engineers Guide, 1937 Table 11.

American Society of Heating and Ventilating.Engineers Guide, 1937 beused, as direct current would cause electrolytic deterioration.

Heating Ventilating Air Conditioning Guide 1938 PROPORTIONING WALL STACKS The wall stack for an upper floor should be made not less than 70 per cent of the area of the leader.

Heating Ventilating Air Conditioning Guide 1938 ZONING THE SYSTEM The foregoing general outline of procedure will prove satisfactory for the smaller and less complex installations.

Heating Ventilating Air Conditioning Guide 1938 since the direct radiators will furnish heat, but it permits a careless operator to avoid operating the ventilating equipment.

Heating Ventilating Air Conditioning Guide 1938 used largely to wash heavy reclaimable products from the air, and are generally composed of one to three eliminator-type baffle scrubber plates across the air stream.

Heating Ventilating Air Conditioning Guide 1938 to the air and a part of the sensible heat of the initial mixture is trans-. formed to latent heat as evaporation of some of the spray water takes place.

Heating Ventilating Air Conditioning Guide 1938 An idea for producing even distribution of air consists of a perforated ceiling made of a suitable architectural surface and installed a small distance below the normal ceiling level of the room.

Heating Ventilating Air Conditioning Guide 1938 Table 2.

Heating Ventilating Air Conditioning Guide 1938 4 a.

Heating Ventilating Air Conditioning Guide 1938 HORIZONTAL SUPPLY MAINS The horizontal mains supplying the risers at the top of a down-feed system must be liberally sized unless the house tank is set at a much higher elevation than usual.

Heating Ventii^ating Air Conditioning Guide 1939 WINDOW LEAKAGE The amount of infiltration for various types of windows is given in Table 2.