Fantech DBF 110 - 4" Duct Booster FanFantech DBF 110 4" Duct Booster Fan with Pressure Switch DBF 110 is a duct fan designed for boosting air on demand in applications such as extended ductwork, crawlspace ventilation, and dryer exhaust. The product is equipped with a pressure sensing switch that activates the fan once positive pressure is sensed in the duct line. The switch shuts the fan off when the pressure differential falls below the activation level. Features Suitable for 4
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