10"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 15.75"h] 14" Diameter + Product Details Size -

+ Product Details Size - 34"w X 28"h is the size for the duct opening measurement only

Design – Circular return valves - designed to be used in low and medium pressure ventilation air conditioning systems

The first number in a grille size represents the width

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 30" OR 30" x 24" duct opening (measured at the opening)

+ Product Details Size - 8"w X 6"h is the size for the duct opening measurement only

10"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 15.75"h] 14" Diameter + Product Details Size -+ Product Details Size 10"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 75" Width X 15. 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