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It needs some sort of resistance on either the return or supply. The air filter can be used to create that resistance.
 

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It is not that easy or possible to swap an ecm motor with a psc as the wiring from the circuit board has 16 pins for an ecm and a psc uses 2-3 and different relay setup. A psc still needs ductwork to suck against or it will not get up to speed either. has to do with the curve and design of the fan wheel.
Yep, too much free air can burn out a PSC motor far quicker then a VS ECM.
 
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