| sme.org | Society of Manufacturing Engineers |
| smacna.org | Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) |
| nspe.org | National Society of Professional Engineers |
| nebb.org | NEBB Home |
| mcaa.org | The Mechanical Contractors Association Of America! |
| iarw.org | International Association of Refrigerated Warehouses |
| rses.org | Refrigeration Service Engineers Society |
| iiar.org | International Institute of Ammonia Refrigeration |
| ashrae.org | American Society of Heating, Refrigerating, and Air-Conditioning Engineers |
| nwfpa.org | Nwfpa |
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