Haha I wanted to do the same with a few GPU's but I think the moisture will not do em good.
Is is quite an original idea tbh.
Don't worry, water only condense on an object which is colder than air, miners when running are warmer than the surroundings so there will not be condense. My net is to stop insect/flowers/snowflakes from being sucked into the intake of miners, it has large holes (2mm in diameter)
Ah ok, I may run my 800Kh/s for a few days and catch a few bucks, it is a lot colder ouside here now so I can finnaly begin using them as a room heater now!
I love the winter...