A reference standard that defines appropriate fan-balance quality and operating vibration levels has been approved by the American National Standards Institute.

The Air Movement and Control Association's standard, "Balance Quality and Vibration Levels for Fans," is a part of a series of standards and publications that cover the design, manufacture and use of fans. Other standards exist that deal with vibration of machines in general, but this standard considers only fans.

According to the AMCA, vibration is recognized to be an important parameter regarding the fans' mechanical operation.

The association also announced that is has approved revisions to two standards: "Methods for Calculating Fan Sound Ratings from Laboratory Test Data," and "Reverberant Room Method for Sound Testing of Fans."

For information on all of these standards, visit www.amca.org