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- Useful Engineering Conversions
- ACCA -- Air Conditioning Contractors of America
- AFEAS -- Alternative Fluorocarbons Environmental Acceptability Study
- AGA -- American Gas Association
- AMCA -- Air Movement & Control Association
- ANSI -- American National Standards Institute
- ASAE -- American Society of Association Executives
- ASHRAE -- American Society of Heating, Refrigerating & A/C Engineers
- ASME -- American Society of Mechanical Engineers
- ASPE -- American Society of Plumbing Engineers
- CDA -- Copper Development Association
- Envirosense Consortium Inc.
- EPEE --European Partnership for Energy and the Environment
- GAMA -- Gas Appliance Manufacturers Association
- Geothermal Heat Pump Consortium
- HARDI -- Heating, Air Conditioning and Refrigeration Distributors International
- HI -- Hydraulic Institute
- HRAI -- Heating, Refrigerating, & Air-Conditioning Institute of Canada
- IIAR -- International Institute of Ammonia Refrigeration
- NEMA -- National Electrical Manufacturers Association
- RSES -- Refrigeration Service Engineers Society
- SMACNA -- Sheet Metal and Air Conditioning Contractors National Association
- UL -- Underwriters Laboratories Inc.
- CSA International -- Canadian Standards Association
- NSSN -- National Standards Systems Network
- SES -- Standards Engineering Society
- National Fire Protection Association -- (NFPA)
- International Building Officials and Code Administrators International, Inc. --(BOCA)
- TSSA Technical Standards & Safety Authority -- (TSSA)
- American Petroleum Institute -- (API)
- Canadian Gas Association -- (CGA)
- Institute of Electrical and Electronic Engineers
- The Instrumentation, Systems and Automation Society
- Illuminating Engineers Society of North America
- Professional Engineers Ontario
- Electro Federation Canada
- International Electrotechnical Commission
- Envirosense Consortium Inc.
- Ontario Society of Professional Engineers