Homebrew PCBs

I had the good fortune to snag a Leister Labor S7B
hot air wand.  It needs external air.  Near as I can
tell from the specs and my experiments is that I need
about 6CFM at 7PSI for maximum utility.  I could probably
get by on a third of that flow for normal soldering use.
My best small centrifugal blower gives me about 10% of
the flow I want.

Has a 10 foot 1/2" air hose with a power cable running up
the center.  There's a lot of back pressure, so 
something like a hair-dryer blower has almost zero
flow.

Of course, I can take it out into the garage and use it
with the air compressor.  But I'd like to have it usable
inside.  Short of a vacuum cleaner, any suggestions on how to
build a blower that can handle a little back pressure?
Can you stack fans in series to increase the pressure capability?
I envision ten microprocessor fans in a stack and a funnel on the end.


Suggestions?
Thanks, mike