AUTOMATIC BOOSTER DUCT FAN, INLINE FAN WITH PRESSURE SWITCH, 4-INCH

Inline duct fan for boosting airflow in ducting and vent systems to ensure heating or cooling delivery. Automatically activates the ventilation fan by detecting pressure change to eliminate manual adjusting. Differential pressure switch supports mounting in any position to improve directional airflow versatility. Features five fan speed levels powered by the PWM-controlled EC motor for more precise ventilation. Duct Size: 4” | Dim: 11.88 x 9.11 x 9.25 in. | Airflow: 230 CFM | Noise: 60 dBA | Bearings: Dual Ball PRODUCT DESCRIPTION An automatic booster fan designed to improve airflow delivery in longer ductwork for more effective heating or cooling in home or industrial settings. Features a highly intuitive differential pressure switch that senses changes in your ducting to automatically operate its on/off activation. It also allows for mounting in any direction, making it possible to direct airflow vertically, horizontally, or diagonally. The inline duct fan also features five speeds