Architectural Grille AG20 Series 4 in. x 36 in. Solid Aluminum Fixed Bar Supply/Return Air Vent Grille, White-Gloss 200043603 - The Home Depot
Grille for 25" x 20" rough opening, overall size 27" x 22"
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SMI Ventilation Products Victorian Wall Mount 10 in x 8 in - 9-3/4 in. x 11-3/4 in. Overall Size, Polymer Decorative Return Air Grille, White VWM810 - The Home Depot