This Fresh Air Intake Kit from the PelletVent Pro series is a Type B gas component and consists of the duralock system for a tight seal. Allows fresh air into an existing pellet stove installation that had been using inside air. Allows an installer to decide the best possible location for the air intake vent, not the same location as the wall thimble.The 2 diameter, 18 length flex hose expands to approximately 60 Kit includes: faceplate with screen, moisture barrier, aluminum flex, and two clampsADA Compliant: No Collection: PelletVent Pro Finish: Matte Black Fuel Type: BioFuel, Oil, Pellet Inside Diameter: 3 - 4 Material: Galvalume Stainless Steel Pipe Class: Type B Pipe Shape: Round Style: Contemporary Modern Vent Construction: Double Wall Weight: 3