The 2025 model of the H9 Flow features several key upgrades compared to the 2023 version, primarily focused on improved cooling and compatibility. These include angled front-right fan mounts inspired by the H6 Flow for better airflow, support for a 420mm radiator on the top or front-right panel, and an increased bottom fan capacity from 2 × 140 mm to 3 × 140 mm. Additionally, the 2025 model has a removable nylon dust filter on the bottom PSU intake and a full-length cover pre-installed for back-connect motherboards, which can be swapped for a smaller panel for standard layouts. It also supports custom cooling with generous radiator compatibility and includes a built-in fill port under the top panel for easier maintenance.