I'm not too sure. But I hope you have some way of exhausting the massive volumes of air that the fan will suck into your case.
I'd keep that as an intake and have a few fans extra at the top for exhaust... that thing at 800rpm would be about the same as 3x12cm fans at 1200, so it might be worth getting an extra exhaust or two for the top... just to aid in silence
what you could do is put all the other fans as exhaust. but you'll need to be carefull of to much dust getting into the case.
Yeah, you'll def want a massive dust filter on this fan. Are you going to use any kind of fan grill? Make one?
Um, Yep - Dust may be a problem i don't know what i can use as a dust filter. For a guard i have another plastic outer than come with it.