Quote:
Originally Posted by i_am_socket
Either way will work. I'm guessing there will still be some aero drag if it's blocked behind the grill instead of in front, but significantly less than if left open. Try it both ways with some scrap cardboard first and decide which one works/looks better for you.
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The drag comes from the shape of the grill's effect on the airstream, not air going in, so I don't see the point in those rear blocks
The other thing I don't understand is when people block the lower grill but not the upper. Even if you get smooth flow from the bottom one, going up the air will hit the top grill like it's a parachute-- even more so because it's higher pressure and faster air.