This is a standard size (40mm x 40mm x 20mm) 12V DC axial cooling fan, widely used for thermal management in small electronics. It is characterized by its compact size and 12V operation.
Field Engineers
Server Fleet Uniformity
"As a genuine QNAP component, the FAN-4020-12V ensures 100% compatibility for Server Fleet Uniformity. It is an essential part for Field Engineers tasked with hardware lifecycle maintenance."