Fans

=Description= Fans can be used to mechanically blow objects or to heat/cool objects using the supplied air. There are a wide variety of fans that can be used for different purposes, but some fans are not legal, depending on the allowed electronics.

=Fan types=

Box or Axial Flow Fans

 * Brushless Fans
 * The common computer fan is a brushless fan. These fans are driven by brushless motors, which rather than using mechanical switching to change which coils are energized and thereby generate the rotational motion, use integrated circuits and transistors. This allows for more precise speed control, but depending on the rules you are building under, such electronics may be illegal.

Crossflow or Tangential Fans
=Acquisition=

Appliances
Fans in large appliances like vacuum cleaners are AC motors are therefore not useful. Smaller appliances are more likely to be using DC motors to power their fans, though in some cases you may have to remove a rectifier circuit from the motor terminals. Hair dryers are usually a good bet. Dust busters and other similar rechargeable devices will be using DC fans.

Purchasing
All electronics surplus retailers will carry fans of various types. Radioshack and other similar stores will have some fans, but watch out for brushless fans if your rules prohibit such electronics.