Testing, adjusting, balancing - Wikipedia
https://en.wikipedia.org/wiki/Testing,_adjusting,_balancing
In heating, ventilation, and air conditioning (HVAC), testing, adjusting and balancing (TAB) are the three major steps used to achieve proper operation of heating, ventilation, and air conditioning systems. TAB usually refers to commercial building construction and the specialized contractors who employ personnel that perform this service. In general, the TAB specialist performs air …
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