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Maaa s Heating Ventilating Air Conditioning GUIDE 1941 An Instrument of Service prepared for the Profession--Containing a Technical Data Section of reference material on the design and specification of heating, ventilating and air conditioning systems based on--the Trans actions--the Investigations of the Research Laboratory and Co operating Institutions--and the Practice of the Members and . Friends of the Society together with a Manufacturers' Catalog Data Section i- Containing Essential and Reliable Information concerning Modern Equipment also The Roll of Membership of the Society WITH w Complete Indexes, to;Technical and CataloiT-Data -Sections Vo! 19 $5.03 per Copy (With thumb index $5.50) X831057 Published Annually by American Society of Heating and Ventilating Engineers 51 Madison Avenue New ^orr./N. Y. V