22"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 27.75"h] 12in diameter High Quality – Solid rigid 4 X 12 Is CRFG2028 Width_14in

High Quality – Solid rigid steel body for durability and reliability with dampers operable by switch for airflow directional control

+ Product Details Size – 18"w X 20"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 12" Width X 10" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 10" OR 10" x 28" duct opening (measured at the opening)

22"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 23.75"w x 27.75"h] 12in diameter High Quality – Solid rigid 4 X 12 Is CRFG2028 Width_14in High Quality – Solid rigid steel body for durability and reliability with dampers operable by switch for airflow directional control + Product Details Size – 18"w X 20"h is the size for the duct opening measurement only