Quote:
Originally Posted by Shonen
by cutting up the shroud you decrease backpressure and thus increase CFM, but because the shroud isn't directing the air around the motor, you can't cool the motor as effectively. the air is supposed to flow around the motor, between the shroud and the motor fins. If you wanted maximum airflow, you would just ziptie the fan to the top of the motor without a shroud.
What you're effectively saying in PC terms is that instead of having system/cpu fans inside the case, it's much better to take out the fans and instead put the entire case in front of a fan moving huge amounts of air. Sure, backpressure will drop CFM's but what's the point if what CFM's you have are not being used effectively?
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By opening the bottom of the shroud the air flow is allowed to move across a larger portion of the motor with greater cfm therefore taking more heat with it!
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