Check out the page I linked and scroll down. It shows what kind of cooling configurations are supported. Early versions of the case did not have a bottom dust filter, but the webpage says there is a filter at the bottom now...I'd double check with the manufacturer.
From the link:
2 x 120mm fan in the back (pretty sure they meant front)
2 x 120mm fan at the bottom
1 x 80mm fan at the back