10"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 7.75"h] flat stamped steel + Product Details Size -

+ Product Details Size - 32"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 30 5/8" height

Design – These Supply Diffusers with integral round necks are recommended for heating

actual front end outer dimensions are approximately 14 5/8" width X 30 5/8" height

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10"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 7.75"h] flat stamped steel + Product Details Size -+ Product Details Size 10"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 7. 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