30"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 7.75"h] 14" Round Duct Pipe actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 30 5/8" width X 22 5/8" height

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 8" duct openings

with actual outer dimensions of 34

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

30"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 7.75"h] 14" Round Duct Pipe actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 30 5 8" width X 22 5 8" height Actual Filter Size – 24 3 4"w x 9 3 4" x 1"