The Rhino 2EC controller is a small but powerful EC controller with built-in fan balancer. It controls and balances Rhino Ultra Fans, allowing you to fine tune your environment to create negative pressure. Thermostatic control keeps the temperature perfectly at set point, maintaining the environment. It plugs directly into Rhino Ultra Fans, so there is no need for an external power supply, allowing complete fan control with maximum and minimum fan speed to be set.