I have to disappoint you all, S7 is full of chips and cooling elements in ,what is a lethal combination.

It is hot air tornado!!.  Much worst than S5.
Unfortunately inside S7 is so overcrowded with chip and cooling elements ..the method with other quieter fan does not help.


I remind mistake for one destroyed and burned part of my FEW S5!!!. fell internet or pool and miner was ordered from does not count and so reduce the fan speed to a minimum.
But the driver software what had Stop of counting in the chips, NOOT stopped counting in  the chips and they counted on, so one part of S5 is the burnt...   i have pictures in S5 thread
That  error but affected thousands of people. bitmain  still did not give a new firmware for s5 and i cant flash my s5 for some error

So you GIVE great care to ensure that such same error does not affect your expensive  S7 $ 2,000.