20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 13.75"h] Fixed Blades with Damper + Product Description The Clear

+ Product Description The Clear Plastic Thermostat Guard provides reliable protection and security for your thermostat while ensuring optimal functionality

Design – Circular air supply valves - designed to be used in low and medium pressure ventilation air conditioning systems

Actual Filter Size – 31 3/4"w x 29 3/4" x 1"

featuring a 6" round duct opening

20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 13.75"h] Fixed Blades with Damper + Product Description The Clear+ Product Details Size 20"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 13. 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