The cooling concept in the IN WIN 305 is anything but standard. The theory is that cool air is drawn in from the lower, dust-filtered side and expelled from the top or back. At the bottom, a maximum of three 120mm fans can be installed. The rear can accommodate either a 120mm fan or a 120mm radiator. The uniqueness of the cooling concept also lies in the cover for the power supply, as a maximum of three 120mm fans or a radiator up to 360mm in size can be mounted vertically on the honeycomb structure. Warm air is intended to be carried past the power supply through the side panel of the case (also featuring a honeycomb structure) to the outside. The vertical orientation of the upper cooling components is particularly impressive due to the large side window; however, fans or radiators must not exceed a height of 70mm. To provide users with complete freedom in choosing their case cooling, no fans are included.