Arctic's Liquid Freezer III - 360 A-RGB liquid CPU cooler may not be compatible with the NZXT H6 Flow RGB case due to its 38mm radiator thickness, whereas the H6 Flow case only supports radiators up to 30mm thick. However, some users may have managed to install it with specific modifications or configurations. For a trouble-free installation, it is advisable to check the exact specifications of the enclosure and cooler.