• McQuay International

• Met-Pro Corporation

• Mike Green Fire Equipment Co.

• Milcor/Lima Register Co.

• Miller Lumber Company

• Murphy-Rodgers

• Murray Sheet Metal Co.

• National Systems of Garage Ventilation

• New York Blower Company

• Niagara Blower Co.

• Nordic Air

• Nortex Industrial Fan Co.

• Northwest Envirofan

• Patton?s, Inc.

• Penn Ventilation Companies

• Philip E Bath Inc.

• Pottorff Co.

• Powrmatic of Canada Ltd.

• QuickDraft Div.

• Quietaire Corporation

• R & D Energy Savers Ltd.

• RSArchitects

• Rapid Fan & Blower Inc.

• Robertson Mfg. & Engrg Int'L

• Rupp Industries Inc.

• Schwank USA