Addition of sand louvers to AMCA Certified Ratings Program enables comparison of manufacturers' ratings for sand rejection based on test data in accordance with ANSI/AMCA Standard 510-L (Rev. 2015) Laboratory Methods of Testing Louvers for Rating. Tests for sand rejection are being conducted by Thomas Bell-Wright International Consultants in Dubai. Certification of test data must be performed in compliance with AMCA Publication 511-10 (Rev. 2015), Product Rating Manual for Air Control Devices.