Before buying the tempest evo i looked on Google. Lot of people said evo fans are better in terms of airflow. But from my experience with this case: front fans hardly bring any air, even without front bezel dust filter so i used dremel to cut off fan cover, now its just a little better. Side fan is too close to the mesh. You need little gap between the mesh and fan blades for better airflow. I think its better to use mesh with large hole or fan grill. Same goes with rear 120mm.Top 140mm are somewhat useful. They push some air but not enough for my taste.
To improve airflow i ordered cm R4 fans and a pair of Koolance 140mm(91 cfm) + custom fan grill for the side fan.