Description in English:
High Air Flow Air Duct Kit is required when using Intel® Xeon Phi™ coprocessor with passive heat sink (heat sink only, no fan) or non-Intel GPGPU with passive heat sink with the 2000WF Family

Included items: (1) High air flow air duct Note: Intel Xeon Phi cards with active heat sinks are NOT supported in systems configured with the high air flow air duct. Additional Required Accessory: AWFCOPRODUCTBKT: High Air flow Air Duct Bracket Kit & A2UL16RISER2: 2-slot PCIe* Riser card