I am dust crazy. I go to all lengths to keep dust out of my shop. I have a monster central cyclone system and several high end shop vacuums, many with there own small cyclones as well.
The AirExchanger allows you to push the router cooling exhaust air out the sides without affecting the air inside your dust shoe. This allows for a smaller more efficient shoe.
The AirExchanger It took me almost a year to develop and I hove one installed on all my machines. . . .