6"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 15.75"h] 14" Diameter + Product Details Size -

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 27 5/8" height -

+ Product Details Size - 6"w X 30"h X 2"d (for duct opening measurement only)

Actual Filter Size – 7 3/4"w x 27 3/4" x 1"

actual front end outer dimensions are approximately 32 5/8" width X 26 5/8" height -

6"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 15.75"h] 14" Diameter + Product Details Size -+ Product Details Size 6"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 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 wear