Your search for "nxa-fan" revealed the following:
NEW Cisco N9K-SC-A Nexus 9000 Series System Controller Switch Module
SKU: NSN-7984
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N9K-SC-A Nexus 9000 Series System Controller Switch Module
SKU: NSH-6178
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C9508-FM-E Nexus 9500 8x Slot 800 Gbps Cloud Scale Fabric Module
SKU: NSN-0721
Condition: New
Shipping: Overnight Options
Warranty: 365 days