30"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 35.75"h] Powder-Coated + Product Details Size – VF-WB 2x12 PB our damper helps create 6" Round Duct Pipe

+ Product Details Size – 10"w X 12"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 30" or 30" x 10" duct opening (measured at the opening)

actual front end outer dimensions are approximately 21 5/8" width X 31 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 10" OR 10" x 22" duct opening (measured at the opening)

+ Product Details Size – 34" x 36" or 36" x 34" is the size for the duct opening measurement only

30"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 35.75"h] Powder Coated + Product Details Size – VF WB 2x12 PB our damper helps create 6" Round Duct Pipe + Product Details Size – 10"w X 12"h is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 30" or 30" x 10" duct opening (measured at the opening)