In an attempt to restore some credibility and to alleviate some of the above-mentioned problems, the fan manufacturers have fought back. Through the fan manufacturers' trade association, AMCA (Air Movement and Control Association), a standard identifying the appropriate levels of balance and vibration for fans was created. AMCA Standard 204 "Balance Quality And Vibration Levels For Fans" was issued in 1998 and has been approved by ANSI. If it is well received and accepted (as are most of the other AMCA standards), most of the difficulties and problems will be corrected.
No matter what happens in the future, it will be necessary for people in the fan industry to become better educated in the field of vibration. Expectations for fewer vibration problems will continue to grow, just as we expect our cars to last longer and have fewer problems. We must be able to communicate with the growing community of vibration experts.