This standard applies to propeller fans for use in heating, refrigerating, and air-conditioning units. The fans may be of a built-up or monolithic construction and with or without resilient hubs. The sizes typically range from 10 in. (250 mm) to 30 in. (760 mm) in diameter.

This standard covers only fans intended to be mounted directly on the shaft of the drive motor.

This test characterizes the fan by itself, independent of the specific application for which the fan is intended.

A method for predicting the critical spends from the test data is included.

The scope of this standard does not cover

(a) resonances in the motor/support system,

(b) torsional resonances excited by motor torque pulsations, or

(c) test methods for the reliability qualifications of fans in a given application; these will be covered in proposed ASHRAE Standard 87.2 currently under development.