This standard is designed to primarily avoid confusion in the interpretations of requirements and by the use of symbols from Y32.2.4 on their plans, architects, contractors. Also, engineers will have a standard method of indication heating, ventilating & air conditioning.
ASME Y32.2.4-1949(R1998) history
0000 ASME Y32.2.4-1949(R1998)
1949ASME Y32.2.4-1949 Graphic Symbols For Heating, Ventilating And Air Conditioning (Y32.2.4 - 1949)