30"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 23.75"h] Grilles actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 32 5/8" width X 24 5/8" height -

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

The total outer size of this grille is the listed size plus 2

Actual Filter Size – 25 3/4"w x 9 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 14" or 14" x 8" duct opening (measured at the opening)

30"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 23.75"h] Grilles actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 32 5 8" width X 24 5 8" height + Product Details Size 12"w X 36"h is the size for the duct opening measurement only