Your search for "ffantray-mx240" revealed the following:
Juniper FFANTRAY-MX240-HC-S MX240 Series High Capacity Switch Fan Tray
SKU: NSH-9640
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper FFANTRAY-MX240-HC MX240 Series Enhanced Router Fan Tray
SKU: NSB-4300
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days