NZXT Zero Full Tower Aluminum Chassis
 

"The rear of the case offers two 120mm exhaust fans. I was happy to see a free-flowing design with these exhaust ports, rather than the restrictive grill designs that many other case manufacturers use. You can also see that two thumb-screws are used to hold the left side panel in place, allowing you to gain access to the case without the need for a screwdriver."

http://www.ocia.net/reviews/nzxtzero/page1.shtml