DSP6DK-1, 6" Damper Kit, Allows The Operator To Alter The Amount Of Air Drawn Through The Venting System, Controlling The Stoves Combustion, Must Be Installed Directly On The Stoves Flue Outlet Where Applicable, When Handle Is In Horizontal Position, The Damper Is Closed, Reducing Combustion, When Handle Is In Vertical Position, The Damper Is Wide Open, No Reduction Of Combustion.