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V ; TWENTIETH ANNIVERSARY EDITION 19224942 In 1922; when the first edition of THE GUIDE was pub lished, a group of 80 leading manufacturers provided equipment data of great value to the 5000 engineers, architects, contractors, and others in the profession and the industry who received this reference volume. It is noteworthy that in every succeeding . edition--now the Twentieth Anniversary Edition--14 of the firms originally using THE GUIDE have continued their service to its readers. Here is the Honor Roll: American Blower Corporation. Kewanee Boiler Corporation American Radiator & Standard Nash Engineering Company Sanitary Corporation Powers Regulator Company -'- Buffalo Forge Company Sarco Company, Incorporated Carrier Corporation The Trane Company ^ ' i C. A. Dunham Company United States Radiator Hoffman Specialty Company Corporation , ; Johnson Service Company Warren Webster & Company -; ' '4. . ACKNOWLEDGEMENT For their valued assistance' in the development and expansion of THE GUIDE to its present place as the recognized authority in the field of heating, ventilating and air conditioning, the Guide Publication Committee' ; offers sincere thanks to these manufacturers--and to the 162 others who participate in this annual edition. Annually, since 1937, more than 10,000 men in the pro fession and the industry procure THE GUIDE and utilize the information supplied by these manufacturers. ) Heating Ventilating Air Conditioning Guide, 1942 Air Conditioning...,................................. 865-916 Air System Equipment................ 917-986 Controls and Instruments..................... 987-1014 Heating Systems............................. 1015-1090 Insulation...................................................... 1091-1123 ALPHABETICAL INDEX TO ADVERTISERS A Acme Industries, Incorporated, Jackson, Michigan................. ................................. 938 ' Aerofin Corporation, 410 S. Geddes St., Syracuse, N. Y..........J....................... 939-941 Air Conditioning & OilHeat (a pub.), 232 Madison Ave., New York,-N. Y..:.....'..: 1124 Air & Refrigeration Corporation, 475 Fifth Ave., New York, N. Y___ :................. 867 Air Control Products, Inc., Coopersville, Mich........................ ............. ...... . 968 Air-Maze Corporation, 5202 Harvard Ave., Cleveland, Ohio.................. ........ . 918^919 Airtemp, Division of Chrysler Corporation, Dayton, Ohio__ ,........... 878-879 Airtherm Manufacturing'Co., 710 S. Spring Ave., St. Louis, Mo.... -.... ...........1... 892 Alco Valve Co., Inc., 2638 Big Bend Blvd., St. Louis, Mo,._,,....... ..................988 Aluminum Aircell Insulation Co., Curtis Bldg., Detroit, Mich.... ........................... 1092 American Air Filter Co., Inc., 673 Central Ave., Louisville, Ky........ ............... 920-921 American Artisan (a pub.), 6 N. Michigan Ave., Chicago, 111..... .......................... 1126 American Blower Corporation, Detroit, Mich........ ........................................... 868-869 American Brass Co., The, Waterbury, .Conn............................................... . 1088-1089 American Coolair Corporation, Jacksonville, Fla........ ............. ......................... . 952-953 American District Steam Company, North Tonawanda, N. Y....................... 1074,1117 American Moistening Company, Providence, R. I..... ...... ........................................ 934 American Radiator & Standard Sanitary Corporation, Pittsburgh, Pa......... 1040-1041 American Rolling Mill Co., The, Middletown, Ohio..... ........ ................................. ..* 982 American Society of Refrigerating Engineers, 50 West 40th St., New York, N. Y... 1125 American_ Schaeffer & Budenberg Instrument Div., Manning, Maxwell & Moore, Inc., Bridgeport, Conn........... ................ ..... . 1002 > Anderson Products, Inc., Cambridge, Mass............................................................... 1084 Anemostat Corp. of America, 10 East 39th St., New York City, N. Y.._............. 969 April Showers Company, 4126 Eighth St., N. W., Washington, D. C.... ............. 935 Armstrong Cork Company, Lancaster, Pa................................................................. 1093 Armstrong Machine Works, 851 Maple St., Three Rivers, Mich................... 1076-1077 Ashcroft American Gauge.Div., Manning, Maxwell & Moore, Inc., Bridgeport, Conn:.................................................................... ............ ................. 1002 Auer Register Co., The, 3608 Payne Ave., Cleveland, Ohio,--................................. 970 Automatic Products Company, 2450 North 32nd St., Milwaukee, Wis,...__....... 989 Autovent Fan & Blower Co., Div., Herman Nelson Corp., The, Moline, 111.:........ 907 859