Field Controls 8MG1 Gas Fired Furnace/Boiler Draft Control

Gas Fired Furnace/Boiler Draft Control; Type Draft Control, Double Acting; Used On Gas Fired Furnace and Boiler; Overall Dimension 8-11/16 Inch Outer Diameter; Control Size 8 Inch; Nominal Capacity 50.3 Square Inch; Circumference 22 to 25-1/4 Inch; Material Thickness 20 Gauge (Ring/Gate), 26 Gauge (Collar); Approval UL (Canada and US), CSA