30"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 9.75"h] Aluminum Adjustable Curved Blade Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 23 3/4" x 1"

Actual Filter Size – 33 3/4"w x 15 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 8 5/8" height

scratch-resistant surface that maintains its shine over time

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 8" or 8" x 12" duct opening (measured at the opening)

30"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 9.75"h] Aluminum Adjustable Curved Blade Actual Filter Size – 17+ Product Details Size 30"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 9. 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