12"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 23.75"h] 18" Round Duct Pipe + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 30" or 30" x 6" duct opening (measured at the opening)

+ Product Details Size – 22"w X 18"h is the size for the duct opening measurement only

12" x 6" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

12"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 23.75"h] 18" Round Duct Pipe + Product Details Perfect Fit+ Product Details Size 12"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 23. 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