Your search for "nxa-fan" revealed the following:
Juniper QFX5110-FANAFO F-B Switch Fan Module for QFX5110, QFX5120, EX4650 Series
SKU: NSH-9463
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5220-32CD-FANAO Front-to-Back Airflow Switch Fan Module
SKU: NSB-7926
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5100-FAN-AFI B-F Airflow Switch Fan Module for QFX5100 and EX4600
SKU: NSN-0282
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5110-FANAFO EX4650 Series Front-to-Back Airflow Switch Fan Module
SKU: NSB-9567
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco N2K-C2232-FAN-B Nexus 2000 Front-to-Back Airflow Switch Fan Module
SKU: NSB-7153
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco NCS-1RU-FAN-FW NCS Series Front-to-Back Airflow Router Fan
SKU: NSN-9478
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N2K-C2248-FAN Nexus 2000 Back-to-Front Airflow Switch Fan Module
SKU: NSN-0420
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper EX4400-FAN-AFI EX4400 Series Switch Fan Module
SKU: NSB-7767
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N5K-C5696-FAN Back-to-Front Airflow (Port Side Exhaust) Fan Module
SKU: NSN-0297
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper SRX5800-FAN SRX5800 Series Services Gateway 6x Fan Tray
SKU: NSB-0350
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days