16"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 25.75"h] Return + Product Details Perfect Fit AD-S-230-10x10 Actual Filter Size 25 Width_8in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 36" OR 36" x 26" duct opening (measured at the opening)

Actual Filter Size – 33 3/4"w x 7 3/4" x 1"

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+ Product Details Size – 36"w X 26"h is the size for the duct opening measurement only

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

16"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 17.75"w x 25.75"h] Return + Product Details Perfect Fit AD S 230 10x10 Actual Filter Size 25 Width_8in + Product Details Perfect Fit & Easy Sizing Designed for a 26" x 36" OR 36" x 26" duct opening (measured at the opening) Actual Filter Size – 33 3 4"w x 7 3 4" x 1"