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Mechanical Systems Associations:
Air Conditioning and Refrigeration Institute....
Air Conditioning Contractors of America....
Air Diffusion Council....
Air Movement and Control Association International....
American Boiler Manufacturers Association....
American Gas Association....
American Gas Cooling Center....
American Pipe Fittings Association....
American Society of Heating, Refrigeration and Air-Conditioning Engineers....
American Society of Mechanical Engineers....
American Society of Plumbing Engineers....
American Society of Sanitary Engineers....
Associated Air Balance Council....
Cable Tray Institute....
Canadian Institute of Plumbing and Heating....
Cast Iron Soil Pipe Institute....
Cooling Technology Institute....
Ductile Iron Pipe Research Assoc....
Envirosense Consortium....
Fiberglass Tank and Pipe Institute....
Gas Research Institute....
Geothermal Energy Association....
Geothermal Heat Pump Consortium....
Heat Exchange Institute....
Heat Pipe Science Foundation....
Heating Refrigeration & Air Conditioning Institute of Canada....
Hydraulic Institute....
Industrial Ventilation Research Foundation....
International Association of Plumbing and Mechanical Officials....
International Groundsource Heat Pump Association....
International Institute of Ammonia Refrigeration....
International Institute of Refrigeration....
Manufacturers Standardization Society of the Valve and Fittings Industry....
Mechanical Contractors Association of America....
Medical Gas Professional Healthcare Organization....
Metal Contractor's Association....
National Air Duct Cleaners Association....
NationalAssociation of Plumbing-Heating-Cooling Contractors....
National Board of Boiler and Pressure Vessel Inspectors....
National Clay Pipe Institute....
North American Heating, Refrigeration & Air Conditioning Wholesalers Association....
Plastic Pipe and Fittings Association....
Plastics Pipe Institute....
Plumbing and Drainage Institute....
Plumbing Heating Cooling Contractors Association....
Plumbing Manufacturers Institute....
Refrigeration Service Engineers Society....
Sheet Metal and Air Conditioning Contractors National Association....
Steel Tube Institute of North America....
Used Oil Management Association....
Valve Manufacturers Association....