10"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 9.75"h] 2-Way + Product Details Size -

+ Product Details Size - 6"w X 36"h X 2"d (for duct opening measurement only)

Actual Filter Size – 9 3/4"w x 33 3/4" x 1"

+ Product Details Size – 24" x 24" with 8" collar T-Bar drop ceiling perforated return grill - metal back casing

Do not measure the overall size of the register itself

10"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 9.75"h] 2-Way + Product Details Size -+ Product Details Size 10"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 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