Squirrel Cage fan

I liked the High Speed Turbine thing:1102656 and had some questions about squirrel cage fans. So I designed this housing and several squirrel fans to try out.
The housing attaches to the main stage as does the fan
New Volute added. It is slightly narrower to reduce end gap to the fan as well as closer to fan at start.
Added fans with different number of blades and offset. One is mirror of the other. Fans run CCW.