Rid your range hood or microwave of undesirable air via this Master Flow 7 in. x 7 in. Butterfly Damper that installs on a round exhaust duct with a 7 in. diameter. Rust-resistant aluminum blades ensure long-lasting protection against corrosion， and a 400-degree Fahrenheit maximum operating temperature ensures reliability in high-heat conditions.
Durable 30-gauge single-wall steel construction with rust-resistant aluminum blades
Designed to vent a range hood or microwave via a round exhaust duct
Fits most round ducts with 7 in. diameters
Split-sided gravity damper design
390 degrees Fahrenheit maximum operating temperature for reliability in high-heat applications
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