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134 ASHRAE Guide And Data Book CURTIS MANUFACTURING COMPANY AIR CONDITIONING--REFRIGERATION DIVISION St. Louis, Missouri 63133 U.S.A* the Complete Line of AIR CONDITIONING AND REFRIGERATION EQUIPMENT INDUSTRIAL COMMERCIAL RESIDENTIAL Curtis offers a complete line of con densing units, liquid chillers, roof top air conditioning units and pack aged air conditioners for all applica tions. With Curtis equipment, you are assured of dependable perform ance at rated capacities. Each piece of equipment is factory engineered, assembled, and tested to reduce in stallation time and maintenance. For high quality units at competitive prices, remember you can count on Curtis. For further information, consult your yellow pages or write: CURTIS MANUFACTURING COMPANY Air Cm4idomi*r Dtalala 1905 Kienien Avenue St. Louis, Mo. 63133 S:\Catalog Data Section 135 D. J. MURRAY MANUFACTURING CO. Wausau, Wisconsin Manufacturers of GRID Cast Iron Steam Heat Transfer Surface Equipment for Industry . . . Since 1883 GRID UNIT HEATERS It's the material that makes the difference. GRID BLAST HEATERS A rugged, strong, endur The heat transfer element of GRID Unit Heaters, Blast Heat ers and Radiators is a hih tensile strength cast iron casting with radiation fins cast in one piece to the steam chamber. The onepiece finned section assures con stant heat transfer. Each finned section is thoroughly tested to in sure against leaking. Fin Sec tions going into service of 160 to 250 PTS.L are stress relieved be fore assembly into finished units. The spacing of the individual fins throughout the -length of the fin section has been carefully deter mined to provide ample heat transfer and still provide a clean, un obstructed air passage through the section. The wide fin spacing prevents clogging and permits easy clean ing. Because each individual fin is strong and cast as an integral part of the steam chamber, GRID units can be cleaned without damage to the heating surface. GRID all cast iron condenser provides the answer to unit heater problems general industry has discovered through common failures of copper, aluminum and steel tube heat transfer surface Grid condenser eliminates internal electrolytic corrosion because all metals in contact with steam are similar. It also-eliminates external corrosion because the cast iron construction resists acid fumes in the air and eliminates use of reducing valves where high steam pressure is used. GRID cast iron construction is tested to with stand steam pressure up to 250 P.S.I. It eliminates the high mainte nance costs generally experienced with other types of condenser construction. It eliminates replacement costs because 'GRID is built to last for years . uninterrupted service records of more than twenty-five years are common among GRID users in in dustry. ing, economical heat trans fer surface describes GRID Blast Heaters, designed for the tough job . . . for low and high pressures . . . re sistant to corrosive ele ments in the atmosphere. With the same one-piece all cast iron condenser con struction as GRID Unit Heaters, GRID Blast Heat ers are designed to with stand operating steam pressures of 250 P.S.I. GRID Blast Heaters require less labor for installation than other forms of cast iron heating surfaces. They require less cubical space . . . eliminate maintenance costs and save on fan horse power. GRID Blast Heaters, constructed in the same manner as GRID Unit Heaters, have, during years of continuous operation on high steam pressures, definitely proven to be long lived and free from maintenance. In places where the air is contaminated with corrosive fumes, GRID Blast Heaters have replaced other types of heating surface. The Grid open design makes possible easy cleaning. Nothing in the air such as dust, lint, fumes, etc., can retard their operation. GRID Blast Heaters are ideal for installation where outside air is brought into the building. CORROSION--inside and out--causes heating equipment fail ures but not when you use GRID cast iron construction nnit heaters . . . Blast heaters . . . radiators. SPECIALLY DESIGNED UNITS FOR GENERAL PLANT PROCESS WORK AND COMFORT HEATING GRID DOWN BLOW UNIT HEATERS With the same one piece construction high test cast iron heating sections as the standard GRID Unit Heaters, GRID Down-Blow or Vertical Unit Heaters differ only from standard units in the arrangement of manifolds, special hanger supports, heavier flanged casing, provision of motor well or de flector between fan and motor to protect motor from excessive heat rising from the unit when fan is not in operation . . . manufactured in models without outlet (as illustrated), and with various outlet arrangements for 1, 2, 3, or 4 way discharge directions. Complete information in separate sec tion of GRID Product Catalog upon request. GRID RADIATORS Various combinations with or without Grill covers. For use in confined areas where motorized units are not desirable. For low or high pressures to 2S0 P.SX Beef Tp Usita. Ur mltd. and/ bulb, 7V4 sad LO Tom Look to the Future u>ith Curtis GRID Blast sec tions Adapted as beat exchanger*. Send for the complete story on GRID UNIT HEATERS, GRID BLAST HEATERS, and CRID Radiation for general plant use ... ask far GRID Product catalog #956.