Our ESP zone panels integrate our 2 and 3 zone panels with our award-winning ESP (Electronic Static Pressure), technology. Each panel comes with a static pressure sensor. As zone dampers open and close, the static pressure sensor continuously monitors the system static pressure. If the static pressure goes above the static pressure setpoint, the panel will send a signal to the selected non-calling zone dampers to begin opening to a point where the static pressure setpoint is maintained. This eliminates the need for a conventional bypass damper. iO HVAC ZP3-HPS-ESP 3-Zone Heat Pump 3H/2C Zone Panel with ESP