Your search for "qfx fan" revealed the following:
NEW Juniper JPSU-850W-DC-AFO QFX5100 Series 850W DC F-B Airflow Power Supply
SKU: NSN-0276
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5110-32Q-DC-AFI 32x 40GB QSFP+ Back-to-Front Airflow (DC) Switch
SKU: NSH-8246
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JPSU-850W-DC-AFI QFX5100 Series 850W DC B-F Airflow Power Supply
SKU: NSN-0278
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5100-48S-D-3AFI 48x 10GB SFP+ 6x 40GB QSFP+ B-F Air (DC) Switch
SKU: NSN-3805
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX520048Y-DPSU-AI QFX5200 DC 650W B-F Airflow Switch Power Supply
SKU: NSB-5049
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5100-24Q-AA-AFI 24x 40GB QSFP+ 1x DW Slot B-F Airflow Switch
SKU: NSN-3775
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco A903-FAN-E ASR 900 Series 12x Fan with Filter Slot Router Fan Tray
SKU: NSH-7247
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5120-48Y-AFO 48x 25GB SFP+ 8x 100GB QSFP28 F-B Air Switch
SKU: NSN-3627
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5100-24Q-D-3AFO 24x 40GB QSFP+ 2x Mod Slots F-B Air (DC) Switch
SKU: NSH-8235
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5220-32CD-AFO 32x 400GB QSFP56-DD Front-to-Back Airflow Switch
SKU: NSN-0931
Condition: New
Shipping: Overnight Options
Warranty: 365 days