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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 ductwork Plastic leak-proof housing Pressure switch Duct runs up to 108 linear feet The DBF 110 features a plastic leak-proof housing and a pressure-sensing switch. Suitable for 4 ductwork. Performance certified by HVI; Conforms to UL Standard 507.