You will find that there is no industry standard and that symbols can vary from one engineer to the next. There should be a Legend of symbols on the mechanical drawings. They convey meaning without words or in conjunction with abbreviations. Symbols are the unspoken language in the construction trade. There are symbols for all kinds of equipment, duct specialties, piping components and for all other trades. Without HVAC symbols the drawings would be crowded with words and sentences in an attempt to explain what is easily explained with a symbol. HVAC Symbols work like the road signs you are familiar with they allow you to discern their meaning by a visual icon or image with very little use of words. These vary from one engineer to the next, but there are some similarities that will help you figure the differences out. In order to understand how to read HVAC drawings, you have to understand the road signs (HVAC Symbols).
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