| would it work better? The lower vents would still potentially retain debris that would otherwise fall out. The only advantage I can see it that nothing protrudes into the air stream. It has been my understanding that the protruding vanes increase the vacuum created by the air moving past the opening. I could be wrong... 
 
 
 
 KKROFFT
 Now occurs everywhere, simultaneously. But it doesn't have to be experienced the moment it happens.   Every now that ever was is still exactly when it was, when it was now.
 Then, in terms of perception, is nothing more than all the nows that are no longer now.   Thus, the difference between now and then is when.    --The Waystoppers Users' Manual  
 
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