Is the vent-sure controlled by the kiln or is there a separate power supply?

Is the vent-sure controlled by the kiln or is there a separate power supply?
  1. The vent is separate from the kiln.
  2. Generally speaking the vent is powered by its own 120 volt circuit (or for most non-USA locations a 220 to 240 volt standard plug power supply).
  3. However, sometimes you see the vent, the ambient exhaust
    fan and the kiln power all connected to a big switch upstream from the
    kiln. 
  4. This forces the user to have the fans on if the kiln is on in
    case they forget to do it.