26"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 19.75"h] w14h14 Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 23 3/4" x 1"

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

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actual front end outer dimensions are approximately 14 5/8" width X 10 5/8" height

26"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 19.75"h] w14h14 Actual Filter Size – 21+ Product Details Size 26"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 19. 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