scope:

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 control 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 terminals)

b. Pressure-dependent volume dampers or valves (including air induction nozzles and dampers)

c. Pressure-compensated volume dampers or valves (including air induction nozzles and dampers)

d. Integral heat exchange

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 does not cover individual control components or products addressed in other ASHRAE standards or methods of testing, including but not limited to, the standards listed in the reference section of this standard.

PURPOSE

This standard specifies instrumentation and facilities, test installation methods, and procedures for measuring the capacity and related performance of constant-volume, variablevolume, and modulating integral diffuser air terminals.