Your search for "QFX520048Y-FAN" revealed the following:

Juniper QFX520048Y-FAN-AI QFX5200 Series Back-to-Front Airflow Switch Fan Module

SKU: NSB-5048
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX520048Y-FAN-AO QFX5200 Series Front-to-Back Airflow Fan Module

SKU: NSB-5047
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days