Simple blower calculations indicate that it would require about 3 HP to drive a "fan" that would boost 480 cfm of air by 1 psi. That would be quite a heater fan motor! A typical heater fan might boost 50 cfm of air by about 3 inches of water (about 0.1 psi). A lot (60?) of these fans would need to be ganged together, in parallel and in series, to produce a positive effect. That is why superchargers (driven either by exhaust-powered turbines or by mechanical drives) were developed years ago.
