Hope this helps Vic Searle and others with Ametek Windjammer blowers.
I have several of these.

There are five wires protruding out of the blower body:

  Green is the ground wire, to be connected to the metal body.
  Black and white are connected to mains neutral and live respectively.
  Red is the DC positive of the reference voltage.
  Blue is the DC negative of the reference voltage.

The reference DC supply is about 4 to 6 volts.  It can be supplied by a
battery or a separate mains power supply such as a camera or cell phone
charger.

The speed of the blower can be adjusted with a small screwdriver.
There is a little hole in the side of the blower body, near to the wind
outlet, with a preset potentiometer inside.

These blowers can supply wind up to 20 inches water gauge pressure.
Their performance is very good, indeed.

Bob Essex
http://www.bobessex.co.uk/