[Amps] Blowers

[Steve Thompson]

I recommend http://www.david-kirkby.co.uk/ham/fanpaper.pdf as bedtime
reading. The mathematical treatment might appear offputting, but at the end
it distills out to some basic equations which give a guide to blower
performance from their physical characteristics.

I've not done experiments to verify the results, but I did have one blower
that looked the part but wouldn't cool a 4CX250. Plugging the numbers in
produced a result that it would be short on pressure.

Steve