They're glued in place, but I could easily rip them off. I'm hesitant to do that though, since they do get a decent amount of dust on them, and the actual chassis only has a dust cover on the bottom.... where there's no air flow... because of the shroud. I literally only bought the case because it was THE ONLY CASE they sold at Fry's that actually supported more than like two 3.5" bays. (and funny enough, LTT started running ads for the case the next week)
Really? That's pretty surprising, the Corsair h100i manual emphasized a few times that they recommended using it as intake, and I just copied the configuration they had in the diagram.
My last closed loop setup was set up as exhaust, but I did that so it would be easier to dust. I wasn't really thinking about airflow on that build, because I was using an old HAF case, so airflow was never an issue.