If installing a 120 or 240 mm radiator in the top, you will have a 35 mm max motherboard component height if you don't use the included extended radiator brackets. If you us them, you will have a maximum height of 46 mm. This is mainly for motherboard I/O-shields, big VRM heat sinks, and RAM, so we recommend that you check your motherboard before trying to install this.
There is also a maximum 121 mm width on radiators.
The 144 mm front radiator restriction for 140 and 280 mm radiators is for the width of the radiator.
*If using a front radiator, please also check out the maximum GPU length article found here