350 CHAPTER 14 1954 Guide fcion efficiency is not always obtained when sufficient excess air is supplied to eliminate incomplete combustion entirely, because the air supply must not only be adequate but also be properly mixed with the combustible gases.

622 CHAPTER 27 1954 Guide The material used for valves of small size is generally brass or bronze for low pressures and forged steel for high pressures, while in the larger sizes either cast-iron, cast-steel or some of the steel alloys are employed.

652 CHAPTER 29 1954 Guide customers having a high load factor (relatively low demand), and those having a low load factor (relatively high demand).

662 CHAPTER 30 1954 Guide tion.

1054 CHAPTER 48 1954 Guide from the air by mechanical separation; finer materials, by electrostatic action.

1160 PIPE BENDING Acme Industries, Inc., 1300 GrinneU Co., Inc., 1232-1233 Parks-Cramer Co., 1188-1189 PIPE, Brass American Brass Co., The, 1256-1257 Revere Copper 4 Brass, Inc., 1259 Wolverine Tube Div. of Calumet 4 Hecla, Inc., 1260 , PIPE CONDUITS (See Conduits, Underground Pipe) PIPE, Copper American Brass Co., The, 1256-1257 Revere Copper 4 Brass, Inc., 1259 Wolverine Tube Div. of Calumet 4 Hecla, Inc., 1260 PIPE COVERING (See Covering Pipe) PIPE, Fabricated Dutton Boilere, Div.

26 CHAPTER 3 1955 Guide Dry-Bulb Temperature.

878 CHAPTER 37 1955 Gwa

906 CHAPTER 39 1955 Guide plenum chamber.

266 CHAPTER 12 1956 Guide V U = coefficient of transmission, air to air, Btu per (hour) (square foot) (Fahr-- enheit degree temperature difference) (Chapter 9)

442 CHAPTER 17 1956 Guide of the National Board of Fire Underwriters for the Installation of Heat Producing Appliances, Heating, Ventilating, Air Conditioning, Blower and Exhaust Systems. 2.

524 CHAPTER 21 VALVE ACCESS PLUG 1956 Guide Steam Heating Systems 525 Fig. 21.

560 CHAPTER 22 1956 Guide teristic can be taken when considering the number and output of the boilers.

786 CHAPTER 34 1956 Guide therefore, care must be exercised in arranging the duct approaches on the entering and leaving sides of the cleaners in order that the air flow may be distributed uniformly over the cross-sectional area.

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