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The point of supercharging isn't the volume of air you pump -your engine will suck in whatever it needs- but the pressure at which you pump it, so your engine can suck in denser air.
Those glorified hair dryers can't possible create more than, say, 1 psi. Put your hand in front of a hair dryer (on low temp!) and you can hold it there. I doubt you could hold your hand in front of a 15 psi super/turbo charger!