iO HVAC Controls ZP6-ESP Six Zone (4H/2C) Panel W/ EspiO HVAC Controls ZP6 ESP Six Zone (4H 2C) Panel w ESP Six Zone (4H 2C) Panel w ESP The ZP6 ESP is a 6 zone panel that integrates our award winning ESP technology to completely eliminate the need to install a bypass damper. This 4H 2C zone panel comes with a static pressure sensor. The system works like any standard zone control system with one exception; a static pressure sensor continuously monitors the system static pressure. If the static pressure