10"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 17.75"h] w20h20 Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 11 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 26" OR 26" x 30" duct opening (measured at the opening)

actual front end outer dimensions are approximately 30 5/8" width X 36 5/8" height

+ Product Details Size - 8"w X 30"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 20" OR 20" x 28" duct opening (measured at the opening)

10"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 17.75"h] w20h20 Actual Filter Size – 13+ Product Details Size 10"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 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