10"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 19.75"h] 14" Round Duct Pipe Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 11 3/4" x 1"

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

+ Product Details Size – 14" x 36" or 36" x 14" is the size for the duct opening measurement only

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+ Product Details Size - 4"w X 22"h is the size for the duct opening measurement only

10"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 19.75"h] 14" Round Duct Pipe Actual Filter Size – 29+ Product Details Size 10"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 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