6"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 37.75"h] 12in diameter Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 15 3/4" x 1"

+ Product Details Size - 14"w X 30"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 14 5/8" width X 10 5/8" height

Filter Size - 27

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

6"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 37.75"h] 12in diameter Actual Filter Size – 29+ Product Details Size 6"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 37. 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