AHRI 275 (2018): Application of Outdoor Unitary Equipment A-weighted Sound Power Ratings

Standard Scope

The purpose of this standard is to establish for outdoor unitary equipment: definitions, procedures for estimating A-weighted Sound Pressure Levels from the A-weighted Sound Power Ratings, and recommended application practices. This standard applies to the outdoor sections of factory-made air-conditioning and heat pump equipment as defined in the following AHRI standards, when rated in accordance with AHRI Standard 270.


  • AHRI Standard 210/240, Unitary Air-conditioning and Air-source Heat Pump Equipment;

  • AHRI Standard 340/360, Commercial and Industrial Unitary Air-conditioning and Heat Pump Equipment (cooling capacity ratings of equal to or less than 40.0 kW);

  • AHRI Standard 1230, Variable Refrigerant Flow (VRF) Multi-split Air-conditioning and Heat Pump Equipment (cooling capacity ratings of equal to or less than 40.0 kW);

  • ANSI/AHRI Standards 1160 (I-P) and 1161 (SI), Heat Pump Pool Heaters.

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