8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 17.75"h] 2-Way Deflection + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 22" OR 22" x 36" duct opening (measured at the opening)

Actual Filter Size – 24 3/4"w x 27 3/4" x 1"

the actual front end outer dimensions are 10" in diameter

+ Product Details Size – 34" x 36" or 36" x 34" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 16 5/8" height

8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 17.75"h] 2-Way Deflection + Product Details Perfect Fit+ Product Details Size 8"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 17. 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 wear