20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 21.75"w x 21.75"h] Fixed Blades with Damper + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 20" OR 20" X 16" duct opening (measured at the opening)

+ Product Description Secure your thermostat with the heavy-duty Beige Metal Thermostat Guard

Suitable For Floor

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

+ Product Details Size - 6"w X 4"h is the size for the duct opening measurement only

20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 21.75"w x 21.75"h] Fixed Blades with Damper + Product Details Perfect Fit+ Product Details Size 20"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 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