Your search for "qfx fan" revealed the following:
NEW Cisco NXA-FAN-30CFM-B Nexus 2000 Front-to-Back Airflow Switch Fan Module
SKU: NSN-2428
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 41.99
• Only 2 remaining
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Ruckus Brocade ICX7750-FAN-I Fan Kit of 4 - B-F Airflow (Port-Side Exhaust)
SKU: NSH-7013
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 64.99
• 10 in stock
Call if you need more
Cisco Meraki MA-FAN-18K F-B Fan Module for MX105, MX250, MX450 Firewalls
SKU: NSB-6419
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 29.99
• Only 2 remaining
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Arista FAN-7011M-R Enhanced Speed B-F Fan for 7280R3, 7050X3, 7132LB, 7050X4
SKU: NSB-5426
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 367.99
• Only 2 remaining
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Juniper EX4500-FANTRAY-BF EX4500 Series Back-to-Front Airflow Switch Fan
SKU: NSH-8956
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 764.99
• Only 2 remaining
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Dell X3WCP Back-to-Front Airflow Fan for Z9100-ON & S5148F Series Switches
SKU: NSB-2229
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 64.99
• 4 in stock
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NEW Ruckus ICX-FAN12-E Front-to-Back Airflow Fan for ICX 7650 7550 7850
SKU: NSN-7968
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 287.99
• Only 2 remaining
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Cisco N9K-C9300-FAN2-B Back-to-Front Airflow (Port-Side Exhaust) Switch Fan
SKU: NSH-6126
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 72.99
• Only 2 remaining
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NEW Juniper QFX5100-24Q-3AFO 24x 40GB QSFP+ 2x Mod Slot Front-to-Back Air Switch
SKU: NSN-1851
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 287.99
• 11 in stock
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Cisco N6K-C6004-FAN-F Back-to-Front Airflow (Fan Side Intake) Switch Fan
SKU: NSH-2896
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 69.99
• Only 2 remaining
Call if you need more