the plastic thing in the front of the case is a card holder for EXTREMELY long cards, o hold them in place and heep the weight of the card from breaking or warping itself, and make it safer to transport. i have only used one of them things with 1 card, an old ISA speech synthesizer. you can take it outta the case, it dont hurt anything.
and BTW, i just ordered 20 of these fans, 10 68 shipping, total of $18.46 im gonna have these everywhere in my room LOL. i'll have them stacked in my case, a few blowholes, stacked LOL. i dunno where i'll manage to put them....