Brand: Jewel

Style: Manual round chain-operated furnace flue damper for central heating systems

Type: Manual damper

Item diameter: 5 in round body

Material: Cast iron construction with attached metal chain and mounting ring

Details: Embossed lettering includes "JEWEL FURNACE", "DETROIT", and "WORKS", slotted rotating handle for opening and closing, three-hole mounting flange, chain pull for remote draft control, small paper tag with handwritten "ON" near the lever

Voltage: Not electric

Compatible product: Central furnace or similar solid-fuel heating appliance

Country of origin: Made in USA

Keywords: vintage furnace part, coal furnace damper, cast iron draft control, heating stove accessory