The 900 does not have filters. The 902 does.
Checking my Antec 900 manual, all four fans on Low pull .47 amp at 12 volts. On High, they pull 1.02 amps.
I tested mine and found no significant improvement in CPU temps running faster than Low. Good thing too. With all 4 fans set to High, it sounds like a freakin' vacuum clean setting on the desk. And I have three systems in Antec 900 cases.