scope:

This standard applies to Central Station Air-handling Units (CSAHU) as defined in Section 3.5.

Purpose. The purpose of this standard is to establish for Central Station Air-handling Unit Casings: definitions; classifications; test requirements; rating requirements; minimum data requirements for Published Ratings; operating requirements; marking and nameplate data; conformance conditions. 

Intent. This standard is intended for the guidance of the industry, including manufacturers, designers, installers, contractors and end users. 

Thermal Performance Rating Limitations. Thermal performance ratings are intended to be used only to compare the construction of different Central Station Air-handling Units. The numerical value associated with the rating class cannot be used to predict actual application Thermal Transmittance through casing or the risk of condensation for any specific Central Station Air-handling Unit. 

Review and Amendment. This standard is subject to review and amendment as technology advances.