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ASHRAE Standard 34 establishes a uniform system for assigning reference numbers, safety classifications, and refrigerant concentration limits to refrigerants.

ASHRAE's Mission and Vision Mission: To serve humanity by advancing the arts and sciences of heating, ventilation, air conditioning, refrigeration and their allied fields. Vision: A healthy and sustainable built environment for all.

Status as an energy code and industry standard Many states apply ASHRAE 90.1 to buildings being constructed or under renovation. Most states apply the standard or equivalent standards for all commercial buildings.

ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) was formed in 1959 by the merger of the American Society of Heating and Air-Conditioning Engineers (ASHAE), founded in 1894, and the American Society of Refrigerating Engineers (ASRE), founded in 1904.

The Standards for Ventilation and Indoor Air Quality ANSI/ASHRAE Standards 62.1 and 62.2 are the recognized standards for ventilation system design and acceptable indoor air quality (IAQ).

In Summary. ASHRAE BTU ratings are determined by testing the performance of portable air conditioners under ideal conditions (80° F/51% RH), whereas SACC BTU ratings are calculated based on a weighted average of a portable air conditioner's performance at different temperatures and humidity levels.