26"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 17.75"h] Color_R-4.2 Yellow Filter Size - 33

Filter Size - 33

Actual Filter Size – 9 3/4"w x 13 3/4" x 1"

+ Product Details Size - 24"w X 14"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 15 3/4" x 1"

+ Product Details Size – 18"w X 34"h is the size for the duct opening measurement only

26"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 17.75"h] Color_R-4.2 Yellow Filter Size - 33+ Product Details Size 26"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 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