20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 37.75"h] Curved Blade Steel Filter Size - 7

Filter Size - 7

with actual outer dimensions of 10

Actual Filter Size – 35 3/4"w x 5 3/4" x 1"

Actual Filter Size – 33 3/4"w x 13 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 36" OR 36" x 26" duct opening (measured at the opening)

20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 37.75"h] Curved Blade Steel Filter Size - 7+ Product Details Size 20"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 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