Your search for "qfx fan" revealed the following:
NEW Juniper EX4400-FAN-AFI EX4400 Series Switch Fan Module
SKU: NSN-1315
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N7K-C7009-FAN Nexus 7000 Series 9-Slot Switch Fan Tray
SKU: NSH-2620
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper SRX5800-HC-FAN SRX5800 Series High Capacity Services Gateway Fan Tray
SKU: NSB-0351
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N7K-C7010-FAN-F Nexus 7000 Series 10-Slot Fabric Switch Fan Tray
SKU: NSN-1623
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco Meraki FAN-MS420-R MS420 Series Switch Fan Module
SKU: NSB-3238
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N2K-C2232-FAN Nexus 2000 Back-to-Front Airflow Switch Fan Module
SKU: NSN-0390
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper JPSU-650W-DC-AFO QFX5120 Series 650W DC F-B Airflow Power Supply
SKU: NSB-0456
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N5624-B-24Q 24x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSN-0330
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco ASR-9922-FAN ASR 9900 Series 12 Fan Router Fan Tray
SKU: NSN-3269
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper JNP-FAN-1RU MX Series Router Fan Tray for MX204
SKU: NSH-7292
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days