Standard HVAC Plan Symbols and Their Meanings The VAV box is short for Variable Air Volume box, which is a type of HVAC system. HVAC Controls Symbols The following HVAC controls symbols include commonly used shapes that represent for measuring temperature, flow, velocity, voltage, current, light, timer, power, and more. The Temperature shape shows a kind of device to measure temperature. Related searches for hvac drawing conventions drawing convention in technical drawingtechnical drawing conventionsdrawing conventions and codesarchitectural drawing conventionstechnical drawing conventions and codesbasic drawing conventions