28"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 19.75"h] white actual front end outer dimensions

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

+ Product Details Size - 4"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 20"h is the size for the duct opening measurement only

much more than required 700 PSI for R410

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening)

28"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 19.75"h] white actual front end outer dimensions+ Product Details Size 28"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 19. 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