tubes.fan module documentationtubes
| Class | In | A fan. |
| Class | Out | A fan. |
| Class | Thru | A fan. |
| Class | _InDrain | The one of the drains associated with an fan.In. |
| Class | _InFount | An _InFount is the
single fount associated with an In. |
| Class | _OutFount | The concrete fount type returned by Out.newFount. |
| Class | _OutDrain | An _OutDrain is the
single IDrain associated
with an Out. |