This 4-inch Fresh Air Metal Vent is designed for combustion systems or general fresh air intake applications. Constructed from sturdy 30-gauge galvanized steel, it features a built-in wire mesh screen to prevent bird and pest entry. The unit is engineered to withstand temperatures up to 390 degrees Fahrenheit and resists corrosion for long-lasting exterior use. It installs easily with sheet metal screws and is compatible with 4-inch round ducting

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