Motorised siren 540 motor

Derived from thingiverse.com/thing:24282

I have made a new housing for an old 540 motor I borrowed. The new housing fits a 540 motor and has feet for mounting.
I have made a video with the 540 running the fan. The 540 is old an defect so it takes 20 amps of my powersupply and drops the voltage to around 3-4V! But it makes a lot of noise though!

Video: youtube.com/watch?v=HVBQGiebi9M

Edit 20/3/2013:
New impeller unit with screw for fixating the wheel on the axis of the motor.