This Recommended Practice (RP), IEST-RP-CC036, will cover the methods and definitions for testing the performance of fan filter units. It will provide customers and suppliers of fan filter units the necessary test protocols for measuring performance in such a manner as to allow direct comparison of units provide by different manufacturers of varying designs and operating features.

The test methods will identify test equipment and testing procedures necessary to measure volumetric air flow, electric power parameters (watts, amps, voltage, and power factor), available external static pressure, sound pressure levels, sound power levels, filter air velocity uniformity, and housing vibration.

These procedures will be applicable for units with AC motors, with DC brushless motors, without constant air flow control, or with constant air flow control. These procedures will be applicable to fan filter units with filter air flow dimensions equal to or less than 4 feet in any direction.

The first edition of Testing Fan Filter Units is under development by Working Group 036 of the IEST Contamination Control Division (WG-CC036).