34"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 29.75"h] Powder Coated + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 32"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 27 5/8" width X 30 5/8" height

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

34"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 35.75"w x 29.75"h] Powder Coated + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 32"w X 8"h is the size for the duct opening measurement only + Product Details Size 10"w X 30"h is the size for the duct opening measurement only