Vent Fan on Roof or No vent Fan? Solutions?

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A radiator fan can be tamed via a PWM motor speed controller. BOth noise and amp draw will be reduced at lesser speeds.

https://www.amazon.com/Performance-Electric-Radiator-Cooling-Assembly/dp/B00H29LPCE

https://www.amazon.com/Controller-A...48&sr=1-4&keywords=pwm+motor+speed+controller

I use inline counter rotating 120MM computer fans and a step down ring to exhaust air through a mushroom vent, About 150CFM for 0.6 amps
, but the radiator fan above could move 5x as much Air.

http://www.defender.com/product.jsp?path=-1|6880|2290139|2290143&id=1647393

Fan speed control is Key, in my opinion.
 
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