8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 17.75"h] 6in diameter + Product Details Size –

+ Product Details Size – 34"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 30 5/8" height

Actual Filter Size – 33 3/4"w x 19 3/4" x 1"

+ Product Details Size – 14" X 4" is the size for the duct opening (floor/vent hole) measurement only

actual front end outer dimensions are approximately 21

8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 17.75"h] 6in diameter + Product Details Size –+ Product Details Size 8"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 17. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never wear