• Tri Dim Filter Corp.

• Tri Med Environmental Research Co.

• Tri-Dim Filter Corp.

• Tri-Mer Corp.

• Trion, Inc.

• Ultratech Industries

• Uni-wash/Polaris Industrial Ventilation Group

• United Air Specialists, Inc.

• United McGill Corporation

• Urban Design Group, Inc.

• Van Air Systems, Inc.

• Van-Packer Co.

• Venmar Ventilation, Inc.

• Vent-Axia Coast Products, Inc.

• Viron International Corp.

• Warminster Fiberglass

• Waterlink/Barnebey Sutcliffe

• White-Rodgers Div.

• Wilson & Hampton

• Wing Draft Inducer Co.

• Wm. W. Meyer & Sons, Inc.

• Woodard Custom Painting, Inc.

• Xideko

• York International Corp.

• Ziegler Industries, Inc.