Ventless Rev 0 Apple II
Woz designed the Apple II, but Steve Jobs clearly had a hand in designing the case. His obsession with design and hatred of fans dates back to the very beginning. No computer in the Apple II line had a fan. The very first didn't even have vents.
Due to issues with overheating, this design was soon modifed to have vents. Early buyers had the option of upgrading to the vented case, and many did. Others, such as the owner of the computer pictured below, added fans.
There is a discussion of the computer here: Apple II rev.0 serial A2S1-0203 up for auction