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Today's Hours 8am - 11pm estThe AC02091 Insulated Flex Pipe is a 10‑foot, 4‑inch diameter flexible duct designed for use with fresh air intake kits on wood or pellet heating appliances. Built with a reinforced CPE core and fiberglass insulation, it helps maintain efficient airflow while minimizing heat loss and reducing condensation. Its flexibility makes it ideal for tight or challenging installation paths, providing a durable, reliable solution for delivering outside combustion air to your heating system.