Your search for "slx fan" revealed the following:
Cisco C4KX-FAN-F Catalyst 4500-X Series Back-to-Front Cooling Switch Fan
SKU: NSH-7066
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco NXA-FAN-160CFM-PI Nexus 9000 F-B Airflow (Port Side Intake) Switch Fan
SKU: NSB-7713
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Nvidia Mellanox MTEF-FANF-C B-F (P2C) Fan for QM8700, SN3700, SN3700C, SN3420
SKU: NSB-6715
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Ruckus Brocade ICX7750-FAN-E Fan Kit of 4 - F-B Airflow (Port Side Intake)
SKU: NSN-4952
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme XN-FAN-001-F VSP 7400 Series Front-to-Back Airflow Switch Fan
SKU: NSH-8531
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Ruckus Brocade ICX7750-FAN-E Front-to-Back Airflow (Port Side Intake) Switch Fan
SKU: NSH-7527
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco NXA-FAN-65CFM-PE Back-to-Front Airflow (Port Side Exhaust) Switch Fan
SKU: NSN-8261
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme SLX9740-40C ExtremeRouting SLX 9740 40x 100GB QSFP28 F-B Airflow Router
SKU: NSB-6384
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper SRX3400-FAN-A SRX3400 Series 4x Fans / FanTray
SKU: NSH-6978
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco NXA-FAN-65CFM-PI Front-to-Back Airflow (Port Side Intake) Switch Fan
SKU: NSN-4647
Condition: New
Shipping: Overnight Options
Warranty: 365 days