Guideline M: Unique Fittings and Service Ports for Flammable Refrigerant Use

This guideline applies to all service ports for use with class A2L, B2L, A2 and A3 refrigerants per the classifications outlined in ANSI/ASHRAE Standard 34. The guideline applies to air-conditioning and commercial refrigeration equipment, such as chillers and unitary equipment, and all refrigerant handling containers, such as refrigerant cylinders and tanks used for service and commissioning.

AHRI Guideline M - 2020

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