The Star Tech.com dual fan hard drive cooling kit provides maximum airflow for hot-running hard drives, preventing overheating failures & extending the life of the drive. The fan unit mounts in any free 5.25-inch half-height drive bay, & the hard drive is mounted directly behind it using the supplied 3.5-inch to 5.25-inch adapter brackets. Fresh cool external air is drawn into the case through a removable, cleanable filter & blown directly over the hard drive by 2 quiet running fans. Perfect for extending the life of hot running hard drives in servers or workstations.