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Manufactured with a black, heavy-duty polyethylene jacket which complies with the HUD requirements for outdoor mobile home or modular home installation. Designed to be used as: a supply and return air duct connecting a selfcontained HVAC system to the main air duct of a mobile or modular home; a complete air duct system and/or branch duct when a horizontal or upflow HVAC system is used in a mobile or modular home; and as a crossover air duct to join the main air ducts of a doublewide mobile or modular home.