The H5 Flow (2024) supports the following radiator sizes:

All measurements provided are for radiators with a standard thickness of 30 mm paired with 26 mm thick fans.  Fans and radiators with combined thickness greater than 60 mm may run into compatibility issues.

Can I top-mount a 360 mm radiator in the H5 Flow (2024)?

Due to the end tanks found on most liquid cooling radiators, the H5 Flow only officially supports 240 mm radiators in a top-mount or 280 mm radiators when using low-profile memory.