you cant exchange it into fiat straight you must first receive your coin then send it to a exchange that accepts the coin and exchange it to fiat if not exchange it first to bitcoin then fiat. you cant withdraw your ico funds through bank its not possible unless someone wants to buy your coin for fiat.
I understand how this works when I invest in many ICO's, but what about
my ICO.
If i receive $40 million worth of Ether, how can I get this into fiat currency?