28"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 23.75"h] Color_Black + Product Details Size - CRFG2028 Width_14in 4 X 12 Is

+ Product Details Size - 28"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 24 5/8" height

Actual Filter Size – 24 3/4"w x 29 3/4" x 1"

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

28"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 29.75"w x 23.75"h] Color_Black + Product Details Size CRFG2028 Width_14in 4 X 12 Is + Product Details Size 28"w X 10"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 24 5 8" width X 24 5 8" height