That's the type that fits in the side of the machine by the wheel.
I've just stuck the filter pad in where the HEPA filter should go and am hoping for the best.
( Bats, Mon 29 Jun 2009, 13:16, archived)

I'm pretty sure you do need the big bit in - in fact I suspect the reason the motor in mine burned out was because my idiot ex girlfriend used it without the filter carriage.
( C, Mon 29 Jun 2009, 13:21, archived)