24"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 25.75"h] Color_R-4.2 Yellow + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246

+ Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only

+ Product Details Size - 34"w X 8"h is the size for the duct opening measurement only

+ Product Spec Sheet Return Air Grille Spec Sheet

Actual Filter Size – 31 3/4"w x 21 3/4" x 1"

rotate it to align with the square frame

24"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 25.75"w x 25.75"h] Color_R 4.2 Yellow + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246 + Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only + Product Details Size 34"w X 8"h is the size for the duct opening measurement only