| | Kelair Products Inc (Spring Grove, IL) Industrial steel plate dampers | |
| | Lloyd Industries Inc (Montgomeryville, PA) HVAC equipment: air handling products & fire dampers | |
| | Lyemance Lock-Top Inc (Jeffersonville, IN) Fireplace dampers | |
| | Penn Ventilation Co Inc (North Wales, PA) Fans, ventilators, dampers & louvers | |
| | PHL Inc (Doylestown, PA) Back draft dampers & releasing devices | |
| | Prefco Products Inc (Buckingham, PA) Fire dampers, smoke & air control dampers | |
| | Rieter Automotive North Amer (Oregon, OH) Automotive sound deadening material: non-woven fabrics & molded dampers | |
| | Safe Air Of Illinois Inc (Cicero, IL) Smoke & fire dampers, architectural aluminum louvers & shutters | |
| | Shan-Rod Inc (Berlin Heights, OH) Butterfly & guillotine valves, dampers, gates & separators | |
| | Techno Corp (Erie, PA) Check & butterfly valves, dampers | |
| | Valv-Tech Inc (Fogelsville, PA) Butterfly & HVAC valves, louvers & dampers; steel & cast iron custom fabricating | |
| | Vent Products Co Inc (Chicago, IL) Louvers, dampers & roof curbs | |
| | Young Regulator Co (Warrensvl Hts, OH) Dampers, heating & air conditioning regulators | |
| | MCM STEEL INC. (Saint Jerome, QC) | |
| | Voys Gas Springs (Kayseri, Turkey) | |
