Air Movement and Control Association (AMCA) International Inc. has released AMCA Publication 511-21 (Rev. 12-22), Certified Ratings Program Product Rating Manual for Air Control Devices.

Superseding AMCA Publication 511-21, AMCA Publication 511-21 (Rev. 12-22) outlines technical procedures and the proper presentation of data for the certification of air-control devices through the AMCA certified ratings program. It is to be used in conjunction with AMCA Publication 11-22, Certified Ratings Program Operating Manual.

Used in general ventilation and air-conditioning systems, air-control devices include louvers, dampers, gravity ventilators, round spiral duct, and transverse duct connections. The focus of the 2022 release was the addition of air-leakage-rating requirements (Section 26, new) and air-performance-rating requirements (Section 15) for “linkage-connected economizer dampers,” previously known as “economizer dampers.”

AMCA Publication 511-21 (Rev. 12-22) includes:

• Updated definitions of “economizer dampers” and “air economizers.”
• The addition of figures for the three general types of linkage-connected economizer dampers (Annex B, new).
• The addition of a table of all of the symbols used in the publication (Section 4.2).
• The addition to most louver sections language clarifying if testing with a drain pan was required.
• For volume-control dampers, the allowance of extrapolation of air-leakage rating outside the tested height (extrapolation beyond the tested width still is prohibited) (Section 16.2.1.2).