36"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 35.75"h] Color_Black Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 7 3/4" x 1"

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 22" OR 22" x 30" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 12" duct openings

36"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 35.75"h] Color_Black Actual Filter Size – 21+ Product Details Size 36"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 35. 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