| GCat | US Laws & Regs |
| MCat | Regulations |
| SCat | ASHRAE |
Standards for the heating, ventilation, refrigeration and air conditioning industries from the American Society of Heating, Refrigerating & Air-Conditioning Engineers
ASHRAE Standards [8348] 
Standards from the American Society of Heating, Refrigerating & Air-Conditioning Engineers (fees)
Standards from the American Society of Heating, Refrigerating & Air-Conditioning Engineers (fees)
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