Aerofin   M.K. Plastics Corporation
American Fan Company   National Pump Company
American Warming &
Ventilating
  RAE Coil
Applied Air   Ruffneck Heaters
Bry-Air, Inc.   Twin City Fan & Blower
Clarage Fan Company   Technical Systems
Commercial Acoustics   The Aeroacoustic Corporation
Harrington Environmental
Engineering
  Torit
Hibon   Walton Humidifier
Kinetics Noise Control   Woods USA
Lewis M. Carter Manufacturing Company