8"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 27.75"h] w14h14 Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 33 3/4" x 1"

+ Product Details Size – 14"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 32 5/8" height -

75"H – fits a 18" X 6" duct opening

+ Product Details Size - 10"w X 8"h X 2"d (for duct opening measurement only)

8"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 27.75"h] w14h14 Actual Filter Size – 23+ Product Details Size 8"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 27. 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