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American Society of Heating and Ventilating Engineers Guide, 1932 equipment in a thorough and authoritative manner has gained for The Guide worldwide recognition and acceptance as the standard reference work on heating and ventilating. This effective means of advertising is selected by leading manufacturers to promote the use of modern equipment and payment for the service rendered enables the American Society of Heating and Ventilating Engineers to publish and distribute The Guide and to extend its wholly philanthropic services io the general advancement of the profession and its allied industries. This 10th edition of The Guide totals 12,000 copies, surpassing in number any previous volume, and is released by the Guide Publication Committee with the sincere wish that it may serve the profession at large as the'indispensable reference authority of this highly specialized and progressive field. D. S. Boyden, Chairman GUIDE PUBLICATION COMMITTEE % xii EDITORIAL ACKNOWLEDGMENT FOR 10 years The A.S.H.V.E. Guide has held unchallenged its enviable position as the authority for the heating and ventilating profession and industry because it is dependable and up-to-date. The achievement of worldwide recognition and prestige among engineers has been possible only because of the willingness of outstanding men to con tribute freely from their knowledge and experience for the benefit of their professional brethren. The Guide 1932 stands upon a solid foundation of research, experience and practice, and the Guide Publication Committee this year has followed in the path of its predecessors by enlisting the aid of the ablest engineers to prepare this 10th anniversary edition. The following specialists have cooperated in the production of The Guide 1932 without thought of compensation for their services other than the pleasure and satisfaction derived from doing their bit in the interest of better engineering: H. L. Alt, New York, N. Y. O. W. Armspach, New York, N..Y. J. L. Blackshaw, Pittsburgh, Pa. C. A. Booth, Buffalo, N. Y. C. P. Bridges, Boston, Mass. R. M. Conner, Cleveland, Ohio V. S. Day, Newark, N. J. N. W. Downes, Kansas City, Mo. M. W. Ehrlich, Lyndhurst, N. J. J. E. Emswiler, Ann Arbor, Mich. M. D. Engle, Boston, Mass. J. A. Fleming, Boston, Mass. F. E. Giesecke, College Station, Texas F. W. Hanburger, New York, N. Y. L. A. Harding, Buffalo, N. Y. Elliott Harrington, Schenectady, N. Y. J. H. Holton, Newark, N. j. H. C. Houghten, Pittsburgh, Pa. John Howatt, Chicago, 111. A. F. Karlson, Fitchburg, Mass. A. P. Kratz, Urbana, 111. G. L.' Larson, Madison, Wis. F. J. Linsenmeyer, Detroit, Mich. George W. Martin, New York, N. Y. V. D: Milliken, St. Joseph, Mich. J. G. Mingle, Indianapolis, Ind. A. W. Moulder, Providence, R. I. H. C. Murphy, Louisville, Ky. Percy Nicholls, Pittsburgh, Pa. R. W. Noland, Ft. Wayne, Ind. E. G. Rack, New York, N. Y. W. M. Richtmann, Rockford, 111. S. I. Rottmayer, Chicago, 111. C. J. Scanlan, LaCrosse, Wis. L. E. Seeley, New Haven, Conn. E. Szekely, Milwaukee, Wis. J. H. Walker, Detroit, Mich. C. P. Yaglou, Boston, Mass. The members of the Society and other users of The Guide 1932, are deeply indebted to these engineers and the Guide Publication Com mittee gladly acknowledges this indebtedness to public service and commends the enthusiasm, cooperation and devotion of these workers who built this bigger and better Guide 1932. GUIDE PUBLICATION COMMITTEE D. S. Boyden, Chairman W. L. Fleisher S. R. Lewis H. S. Haley L. T. M. Ralston P. D. Close, Technical Secretary XIU >, I