14"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 9.75"h] Compatible With Duct 10in + Product Details Size -

+ Product Details Size - The listed 4" diameter refers specifically to the size of the duct opening

Perforated steel grille for return air flow

actual front end outer dimensions are approximately 32 5/8" width X 26 5/8" height -

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 24" OR 24" x 22" duct opening (measured at the opening)

+ Product Details Size - 4"w X 20"h is the size for the duct opening measurement only

14"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 9.75"h] Compatible With Duct 10in + Product Details Size -+ Product Details Size 14"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 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