This damper kit section of pipe installs between your wood stove toward insulated chimney pipe. It has a damper handle to control the amount of air drawn through the system and must be installed directly on the stove's flue outlet. The damper has two positions allowing full venting or reducing venting to 20% for reduced combustion, but not complete blockage. Model DSP has an attractive outer black painted surface made of durable aluminized steel to withstand temperatures up to 1200 degrees F of continuous operation.Allows alteration of the amount of air drawn in, controlling the stoves combustion Must be installed directly on the stoves flue outlet Horizontal handle position for closed damper (reducing combustion) Vertical handle position for wide open damper (no reduction of combustion)Finish: Black Fuel Type: Wood Inside Diameter: 7-8 9 Length: 5-3 4 Material: Aluminized Steel, Stainless Steel Outside Diameter: 8-1 2 Pipe Class: Stove Pipe Pipe Inside Diameter: 8 Pipe Shape: Round Temperature: 1200 degrees F UL Listed: Yes Vent Construction: Double Wall