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ANSI Y32.2.4
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ANSI Y32.2.4 1949 Edition, January 1, 1949 Graphical Symbols for Heating, Ventilating, and Air Conditioning
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Description / Abstract:
This standard has been developed for use on drawings. Architects, contractors, and engineers, by the use of these symbols on their plans, will have a standard method of indication for heating, ventilating, air conditioning, and allied items. Confusion in the interpretations of requirements can thus be avoided.