26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 21.75"h] 3-Way or 4-Way + Product Details Size -

+ Product Details Size - 6"w X 14"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height -

Actual Filter Size – 33 3/4"w x 27 3/4" x 1"

actual front end outer dimensions are approximately 22 5/8" width X 20 5/8" height -

26"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 21.75"h] 3-Way or 4-Way + Product Details Size -+ Product Details Size 26"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 21. 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