Thanks to all. Just to mention, the rack is free-standing, open on all 4 sides, if that makes any difference. Are those fans noisy? (My computer's is).
Putting a fan on the shelf is not a good idea since it will vibrate and will be noisy. I use a fan that is hooked on the (upper) shelf. This fan is originally made as aquarium cooler and has special clips for hooking a shelf. I have changed the 12V transformer to a multi voltage transformer, switched to 4.5V so the fan is very quiet.
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