20"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 19.75"h] 6in diameter Actual Filter Size – 9

Actual Filter Size – 9 3/4"w x 27 3/4" x 1"

with actual outer dimensions of 26

24"w X 6"h Is The Size For The Duct Opening Measurement Only

+ Product Spec Sheet Corner Baseboard Grille Spec Sheet

this guard ensures long-lasting protection and security

20"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 19.75"h] 6in diameter Actual Filter Size – 9+ Product Details Size 20"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 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