This standard applies to air control devices used in air distribution systems. These devices provide control of air volume with or without temperature control by one or more of the following means and may or may not include a fan:

Fixed or adjustable directional vanes (i.e. Bypass Air Terminal)

Pressure dependent volume dampers or valves (including air induction nozzles and Dampers)

Pressure compensated volume dampers or valves (including air induction nozzles and Dampers)

Integral heat exchange

On/off fan control

Variable speed fan control

Integral Diffuser Air Terminals

Purpose. The purpose of this standard is to establish for Air Terminals: definitions; classifications; test requirements; rating requirements; minimum data requirements for Published Ratings; marking and nameplate data; and conformance conditions.