The methods of test in this standard apply to air control devices used in air distribution systems. These devices provide control of air volume with or without temperature by one or more of the following means and may or may not include a fan: a. Fixed or adjustable directional vanes (i.e.@ bypass terminal) b. Pressure-dependent volume dampers or valves (including air induction nozzles and dampers) c. Pressure-independent volume dampers or valves (including air induction nozzles and dampers) d. Integral heat exchanger e. On/off fan control f. Variable-speed fan control g. Modulating integral diffuser terminals This standard covers test methods for use in determining the following performance characteristics: a. Sound power b. Temperature mixing and stratification c. Minimum operating pressure d. Air leakage e. Induced airflow f. Fan airflow g. Fan motor electrical power h. Condensation i. Airflow sensor performance This standard shall not be used for field testing PURPOSE The standard specifies instrumentation@ test installation methods@ and procedures for measuring the capacity and related performance of constant-volume@ variable-volume@ and modulating integral diffuser air terminals.