• 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

• HLW International LLP

• Harriet Anderson Painting, Inc.

• Hart & Cooley Inc.

• Heat-Fab Inc.

• International Chimney Corp.

• Johnston Boiler Company

• Joseph Davis

• Kasten Masonry Sales

• Kemco Systems

• Leedy Electric Corporation

• Leisure Baths Ltd.

• Ludell Mfg. Co.

• Metal-Fab Inc.

• Miniveil Air Systems

• Montfort Brothers

• Murray Sheet Metal Co.

• NAO Inc.

• Naylor Pipe Co.

• Olsen Technology Inc.

• Plastronics

• Powrmatic of Canada Ltd.

• ProTech Systems

• Process Equipment Co.

• QuickDraft Div.

• Quickway Metal Fabricators

• Raypak Canada Ltd.

• Rheem Canada Ltd. Water Heater Div.

• Roberts-Gordon Canada Inc.

• Simpson Dura-Vent Co.

• Southwark Metal Mfg.

• Steam Sauna

• Strait Manufacturing & Welding, Inc.

• Suscon Stacks

• Susquehanna Concrete Products

• T.A. Caid Industries

• Tru-Flex Metal Hose Corp.

• United McGill Corporation

• Van-Packer Co.

• Wesley M. Coble Architect & Planner