Inline blowers feature a square housing that allows them to easily integrate into the ductwork and provide airflow to an HVAC system. Standard forward-curved inline blowers quietly provide large volumes of air and can overcome low static pressures. Their blower wheels use a high number of fan blades that are angled toward the direction of rotation which makes them suited for applications moving clean air at constant pressure and airflow. High-efficiency backward-inclined blowers require less horsepower than forward-curved blower wheels to move a similar volume of air. Their blower wheels use a lower number of fan blades that are angled away from the direction of rotation which makes them suited for high static pressure applications or operating on an extended basis.