You should post this question in the Avalon 741 Hardware thread there is a ton of useful info there, and a lot of people monitor the thread. For future reference.
https://bitcointalk.org/index.php?topic=1673843.0If you can keep your ambient temperature below 25 - 30 degrees C that is good, but you really want to watch is your exhaust temp on your miner status. Mine were staying around 88 C with no issues.
The specs say they operate between -5 and 40 C.
Just make sure to exhaust the hot air from your Miner.
