10"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 37.75"h] Return Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 32 5/8" width X 8 5/8" height -

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening)

+ Product Details Size - 36"w X 20"h is the size for the duct opening measurement only

10"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 37.75"h] Return Actual Filter Size – 17+ Product Details Size 10"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 37. 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