The Schneider Electric HMIYBFKT11 is a fan kit from the Harmony iPC range, designed for Box PC units with a single PCI/PCIe slot. It is classified as an adaptation accessory and replacement part under category 22575-MAGELIS MC3.
The kit is specific to Harmony iPC Box PCs that have a single PCI or PCIe expansion slot. It provides forced-air cooling for the internal bay, which is critical when a PCI/PCIe card is installed and the chassis relies on this fan to maintain airflow across the CPU and expansion area. Without it, thermal derating or shutdown may occur under sustained load.