Why is the AMCA CFM rating so low on the older blowers when the new blowers are made the same way?
The first AMCA tests back in 1989 were performed using the AMCA 210 standard. This was not the best method for testing PPV blowers because it did not take into consideration that the blower is placed away from the entrance opening. In 1995, AMCA developed the latest test standard, AMCA 240-96, with the assistance of a committee of PPV manufacturers. The new standard was a more effective measure of a blower’s performance and the test results were around 30% more than with AMCA 210 test.
