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Originally Posted by jlrii
Very different blade design + typical small dc fan motors no likey reverse polarity. A forward inclined blower has a lot of small blades cupped towards the direction of flow, run it backwards and you get practically no air movement. A reverse inclined blade has a lot fewer blades that are a lot straighter, same deal if run backwards...practically no flow. As BillA noted reverse inclined seen mostly in exhaust aplications, and forward inclined for supply. Not to imply that one couldn't be used for the other, it depends on the specifics of the setup.
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thanks, you are right
reading supplied link now, I might add it is excellent