• Fil-Tec

• Firwin Corp.

• Flexmaster Canada Ltd.

• G.I.S. Inc.

• George Koch Sons

• Gilco Insulation

• Gilsulate International, Inc.

• Glastic Corp.

• Horst Construction Group

• Hot Box

• I C I Group

• IDEX Corporation

• Industrial Acoustics Co.

• Industrial Noise Control

• International Air Filtration

• Jim Barna Log Systems

• Joseph Davis

• Kemco Systems

• Knauf Insulation

• MacIntyre And Company

• Metalflex Division

• Northern Industrial Supply Company

• Nu-Calgon Wholesaler

• Pemko Manufacturing Company

• Pittsburgh Corning Corp.

• Proudfoot Co.