22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 21.75"h] Color_Black Ring Base Design – Allows

Ring Base Design – Allows for easy installation without removing the thermostat

12" Diameter Is The Size For The Duct Opening Measurement Only

This versatile diffuser is adaptable to various airflow needs

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 20" or 20" x 12" duct opening (measured at the opening)

22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 21.75"h] Color_Black Ring Base Design – Allows+ Product Details Size 22"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 21. 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