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The Inductor 4 in. In-Line Duct Fan is an energy efficient way to help circulate heated or cooled air around a room. This duct booster fan is designed to be installed in almost any position in your home or office duct work. This duct fan has a crimp and bead design on both ends for an easy installment. It can fit 4 in. flexible or rigid ducts. This duct fan has a thermally protected Class B motor with large oil reservoir.