The COOLTEK VIER is positioned in terms of price and quality above the cases One, Two, and Three. The case offers space for CPU coolers up to a height of 170 mm due to its width of 223 mm. It is very solidly constructed, with both side panels and the front made of tempered glass. The standard equipment includes three 120 mm RGB fans in the front, which can be controlled in color via a connection on the motherboard (4pin 12V) or an RGB controller. The fan speed can be adjusted through the fan control on the front panel. The side intakes in the front provide sufficient airflow due to the depth of the front panel. At the rear, there is another quiet-running 120 mm fan that supports airflow within the case – this can be replaced with a 140 mm fan if needed. A dust filter that is easy to clean is located below the power supply ventilation opening at the bottom of the case, as well as behind the fans in the front and on the top of the case.