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Your cart is empty.Direct Vent Pro Collection 4" Inner Diameter Co-Linear Direct Vent Masonry Chimney Conversion Kit with Flex The Direct Vent Pro 4" Inner Diameter Co-Linear Direct Vent Masonry Chimney Conversion Kit with Flex is a component that is used in a typical venting installation. Use this kit when installing a direct vent co-linear insert into a masonry chimney. This kit includes: a high-wind termination cap, 2 pieces of aluminum flex lengths - one Red (exhaust), and one Green (air intake). Features: Kit Includes: High Wind Termination Cap, (2) Pieces of Aluminum Flex Lengths Red Flex Exhaust Dimensions: 3" x 35' Green Flex Air Intake Dimensions: 3" x 35' Inner Diameter: 4" Outside Diameter: 6 5/8" Direct Vent Pro features tight inner connections for superb performance, with no gaskets or sealants required (unless specified by the appliance manufacturer). All black pipe lengths, pipe extensions, and elbows feature laser-welded outer wall seams for a sleek finish. Low-profile locks and no hems or beads allow for a beautiful product that looks elegant in any interior. Direct Vent Pro is a unitized, coaxial venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces. Looking for Simpson Dura-Vent? You found it! Simpson Dura-Vent has changed their name to DuraVent. DuraVent is a recognized technological leader in the venting industry. Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting. The company' s research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for Pellet Vent Pro