Join Date: Oct 2008
Location: Toronto, Rogers, SA8300HD + 640GB external drive. Samsung LCD LN40A750 1080p 120Hz. Blu-Ray BD-P1500
Drives are designed to operate safely well above room temperature. So, while room temperature may be your goal, it's entirely unnecessary.
One of my enclosures is over 5 years old, one is 3 or 4 years old, a couple are over a year old. All get heavy use, some of them 24/7. All are fanless and have operated flawlessly. Fans aren't necessary if the enclosure is well designed, as millions of users can attest.
The fact that Seagate has recently had a string of drive failures is not the fault of the enclosures, and there have been Seagate failures even in enclosures with fans.