Despite cleaning remained the problems, so I resorted to the Cooler from Revoltec.
He makes a solid impression and the fans expect good ventilation. The side pockets are nice but not necessary for the operation.
Unfortunately, the problems have remained in spite of the fan, since the air is routed to the wrong places. In addition, the fans are not protected from the bottom.
Therefore, the Cooler went sadly back - too bad.
