Master Flow 7 in. x 7 in. Butterfly Damper

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.