Thank you for your question.
It may be very daring but luckily I isolated all hashboards.
There is no contact with the wood.
Since the housing is open, the miner is generally not too hot.
Its fully rentable, because i do not pay energie ;-)
Salve
Cryptompminer
RE: Antminer Z9 Mini (4 Hashboards) - OpenBenchWoodCube - ! Final over 20Ksols ~560 Watts !