Quote:
Originally Posted by georgec
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!
If you want to relate this to a cpu, you can have as many fans inside the box as you want but if you don't have fans removing the air from the box you are doing nothing but circulating hot air in the box!
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The shroud is there for a reason. Like I said earlier, if you wanted maximum airflow you wouldn't use the shroud at all, just ziptie a fan (probably a larger one) on the top of the motor.
Also, what you said about the pc (not cpu) is entirely correct, it's not the best analogy but that's what I've been trying to tell you. The shrouding ducts the fan so it will push air across the maximum amount of motor surface area while keeping a decent amount of airflow. Pull air through the case (ie. what has to be cooled) even though there's vents, cabling, etc. in the way rather than blast only one part of it with high speed air.