The 2156-4-7320 is a wire leaded Electrolytic Metal Capacitor for use with multi-speed blowers. It is possible to make any ebm blower with a PSC motor a multi-speed blower by adding a second or third capacitor on the load line (blue) at or near the value of the motor run capacitor. Actual capacitor value and RPM achieved are dependant on the nature of each application.