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In my adventures through paintball goggles I found that when you have a dual-fan system like this one, it's most efficient to orient the fans to that one 'blows in' while one 'sucks out'.
Think computer cases; if there's more air being forced in one direction more than any other (all out, all in, more in than out etc) you'll create dead spaces where the air is not being moved as much as it could be.
In the case of goggles this is only theory, but in practice it seemed to be sound theory. Ultimately it comes down to personal preference.
Tape your fans in with a bit of masking tape before you affix them permanently and go do some yardwork.
Find out which way works best for you!
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