This part of ISO 13347 applies to fans as defined in ISO5801 and ISO13349-1. It is limited to the determination 

of airborne sound emission for the specified installation categories. Vibration is not measured, nor is the 

sensitivity of airborne sound emission to vibration effects determined.

The sizes of the fan, which can be tested in accordance with this part of ISO 13347, are limited only by the 

practical aspects of the test installations.

This part of ISO 13347 determines sound power by using sound intensity measurements on a measurement 

surface which encloses the sound source. It provides guidelines on the acoustical environment, ambient 

noise, measurement surface, and number of measurements. The installation categories are generally 

designed to represent the physical orientation of a fan installed in accordance with ISO 5801, ISO 13350 and 

also defined in ISO 13349-1.