Use when installing a direct vent co-linear insert into a masonry chimney. Kit includes: Choice of High-Wind Termination Cap, and two pieces of Aluminum Flex lengths - one Red (exhaust), and one Green (air intake). DirectVent Pro features tight inner connections for superb performance, with no gaskets or sealants required (unless specified by the appliance manufacturer). Low-profile locks and no hems or beads allow for a beautiful product that looks elegant in any interior. DirectVent Pro is a unitized, coaxial venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces.ADA Compliant: No Cap Style: High Wind Finish: Galvanized Fuel Type: Natural Gas, Liquid Propane Green Air Intake Flex: 3 x 4' Includes: (2) Aluminum Flex Lengths, High Wind Termination Cap Material: Aluminum Pipe Class: Direct Vent Pipe Shape: Round Red Exhaust Flex: 4 x 30' UL Listed: No Vent Construction: Double Wall