32"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 9.75"h] 3-Way or 4-Way Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 27 3/4" x 1"

85" width X 9

+ Product Details Size - 4"w X 20"h is the size for the duct opening measurement only

875" width X 12" height

+ Product Details Size – 22" x 24" or 24" x 22" is the size for the duct opening measurement only

32"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 9.75"h] 3-Way or 4-Way Actual Filter Size – 31+ Product Details Size 32"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 33. 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