[Signals]

Pic 6 - 8: Impeller assembly removed. Impellers are made of a hard plastic composite material. They are very smooth. Note: This unit is damaged. That's why the impellers are scratched and gouged.

Pic 9: Main body where impeller assembly fits. Interior is shiny and smooth. Opening on back end is where intake air enters the chamber. Note: Again, this is a damaged unit, hence the scratches and smudges on the interior wall. Air is forced down through triangular opening in bottom.

1 more post coming.