Lian Li PC-A58 Case Review

At the top of the case, you can see a top-mounted fan, and cables for the USB/audio/Firewire. It struck me as very strange that a top-mounted fan is oriented to draw air inwards, and downwards, contrary to the normal rules of thermodynamics and air-cooling. The fan itself is held in place with two-part plastic split pins, and a metal mesh is screwed onto the exhaust side of the fan. What is going on here? There is no point to this mesh with the fan in this orientation, the mesh only serves the purpose of trapping fluff and hair inside the fan. Very strange. I wonder if this is an intentional design or a mistake. It certainly seems wrong to me.