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Originally Posted by mechanicalbrain
I don't think sucking air would be nearly as efficient as propelling it. When air get pushed out it looks like a mushroom (I know not exactly but thats as close as i can describe). When sucking air however, air from all around will rush to fill the vacuum. Hardly something you can aim, think how powerful vacuums are but how short their range is.
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The concept used to explain what you're talking about is "entrainment". Blowing air will drag more air along with it, moving a lot more than just what the fan is capable of. Sucking air doesn't get the same benefit.