Field Controls 4MG1 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 4-9/16 Inch Outer Diameter; Control Size 4 Inch; Nominal Capacity 12.6 Square Inch; Circumference 9-1/2 to 12-1/2 Inch; Material Thickness 24 Gauge (Ring/Gate), 25 Gauge (Collar); Approval UL (Canada and US), CSA