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AMCA 204

2005 Edition, 2005

Complete Document

Balance Quality and Vibration Levels for Fans

Includes all amendments and changes through Reaffirmation Notice , 2012

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Description / Abstract:

This standard covers fans with rigid rotors, generally found in commercial heating, ventilating and air conditioning; industrial process applications; mine/tunnel ventilation applications, and power generation applications. Other applications are not specifically excluded, except as follows:

Excluded are installations that involve severe forces, impacts, or extreme temperature acting on the fan.

Fan foundations and installation practices are beyond the scope of this standard. Foundation design and fan installation are not normally the responsibilities of the fan manufacturer. It is fully expected that the foundation upon which the fan is mounted will provide the support and stability necessary to meet the vibration criteria of the fan as it is delivered from the factory.

Other factors such as impeller cleanliness, aerodynamic conditions, background vibration, operation at rotational speeds other than those agreed upon, and maintenance of the fan affect fan vibration level but are beyond the scope of this standard.

This standard is intended to cover only the balance or vibration of the fan and does not take into account the effect of fan vibration on personnel, equipment, or processes.

Any or all portions of this standard, or modifications thereof, are subject to agreement between the concerned parties.


The purpose of this standard is to define appropriate fan balance quality and operating vibration levels to individuals who specify, manufacture, use, and maintain fans.