ARLINGTON HEIGHTS, Ill. - The Air Movement and Control Association International Inc. announced the certification of products from two manufacturers.

Dynasonics Systems Inc. has two rectangular acoustic duct silencers licensed through AMCA's certified ratings program: models SF34 and SF94.

McGill AirPressure Corp.'s acoustics division has five rectangular acoustic duct silencers licensed: models ARSF-LV-L27, ARSF-MV-L22, ARSF-MV-L24, ARSV-LV-129 and ARSV-LV-L35.