Specifications include, but are not limited to: 1. Return grilles marked ⑤ 18” x 16” on the plan sheet shall be model 50F or equal, aluminum ½” x ½” x ½” egg crate, white finish. 2. Return grille marked ⑤ 24” x 30” on the plan sheet shall be model 23RL or equal, steel, 45-degree deflection, ¾” blade spacing, blades parallel to long dimension, white finish. 3. Supply grille marked Ⓔ 22” x 20” on plan sheet shall be model 272RL or equal steel aero blade double deflection supply grille, ¾” blade spacing, front blades parallel to long dimension, white finish. 4. 24” x 24” louvers shall be white finish, model 1900A or equal Fire-Rated Door Louvers meeting Air Movement and Control Association (AMCA) Publication 511, Class 1A. 5. Construct additional opening in the bottom of existing 16” x 16” rectangular up-return duct, M-EF-6. Install new aluminum grille, white.