If the numbers at 30C as printed are only for the benefit of showcasing the optimal performance temperature ranges, then I would have no problem with the Miner.
That's the intent.
the miner will operate up to 40C, but above 30C the performance (efficiency) decreases for SOME machines.
So, we would have speced, 40C and then increased the +- on the power consumption,
There is no issue about the warranty. you wont void the warranty.
Moderator's note: This post was edited by frodocooper to correct erroneous quote formatting.