Complaint about YY-Cube
 

The way they designed the airflow path at the front of the case is quite inefficient. It's severely restricting the flow of air into the case, and I'm going to have to mod the case's front cover to allow fresh air to come directly in from the front instead of being drawn in from underneath.

Yep, and the left part of the front is quite narrow. Checking Kevins YY-cube shows that You can get 90 mm holes in the front, and there is supposed to be a 120 mm fan in the very same front.
If I don´t mistake myself there are a few diods in the upper left corner of the front that shows disk access, so You can´t make any holes too high up on the front.
It´s a qiute "sealed" case. 1 air outlet that steals air from CPU HSF and 2 outlets to cool the disks above PSU. Should take some modding to get some *in* the case.
regards
Mikael S.

yeah, I hated that too on the case, I ended up taking the duct I used to have on the side of the case, cutting a hole in the front panel and putting it there, was a good fit and looks nice too.