Fantech FR100 - 4" Inline Centrifugal Duct FanFR Series Manual FR Series Specifications FR Series Submittal Fantech FR100 4" Inline Centrifugal Duct Fan A multi purpose inline duct fan for exhaust or supply air; ideal for various residential and commercial ventilation applications including crawl space venting, and air duct boosting. With the motor in the airstream, the FR100 series fan provides constant dissipation of heat build up that gives the fan first in class longevity and reliability
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