18.5"w X 18.5"h Gable Vent, Hon&Guan Aluminum Alloy Attic Vent Wall Vent for Houses, Shed Vents for Interior Doors [Outer Dimensions: 20”x 20”h].

Additional Details from the Manufacturer

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More features

• Size: 18.5"w X 18.5"h gable vent is the size for the duct opening measurement only, actual front end outer dimensions is 20" width X 20" height. Note: A screwdriver is required for disassembly
• With White Mesh: Hon&Guan house vent built-in with a white mesh which especially designed to allow passage of air into your home while stop water and other objects from entering.
• High Quality Aluminum: The premium durable aluminum shed gable vent will never rust, louvers are built to withstand hurricanes, tornados and tropical storm conditions, sturdy fabric grille screen that will not be damaged by long-term exposure to sunlight.
• External Use Only: Hon&Guan wall vent design with noiseless components eliminates vibration and unwanted noise from vents, improving building comfort through ventilation and air flow.
• Safety of Use: This door vent designed with safety in mind, it prevents scratches in case a baby or pet passes by when the vent is open.