• A O Smith Enterprises Ltd.

• A S L (Tomkins Ltd)

• A.C. Dellovade, Inc.

• AHRENS Chimney Technique, Inc.

• AMTROL, Inc.

• Acoustic Standards, Inc.

• American Metal Products - A Masco Co.

• Armstrong Fluid Technology

• Augusta Fiberglass

• B. I. Industries

• Babcock & Wilcox

• Benjamin Heating Products

• Boilersmith Ltd.

• Buckley Associates

• Cambridge Engineering, Inc.

• Chicago Bridge & Iron Co.

• Cleaver-Brooks Division of Aqua-Chem, Inc.

• Crystal Fountains

• Danser

• Federal Block Corp.

• Fireside Hearth & Home

• Foster Wheeler Ltd.

• G. L. Milam's Creative Building Design, Inc.

• Gasmac Inc.

• General Products Co.

• Giffin Sheet Metal