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Well, it's not so much lightning that worries me, although we do have some major electrical storms during the summer thunderstorm periods. My lights do dim and go out on occasion for a few hours. I do have surge protection, but wouldn't stake my life (or miners) on them.
The main reason is that my coin room is cooled by three window fans. Two are sucking air straight in the windows about 6-8 inches in front of the miner air intakes. The way the rain blows sideways around here sometimes would almost ensure that rain would get sucked into the machines. I have tried moving the miner racks about 18" back from the window fans during a rain storm, but the rain and random drips of water, are still being slung toward the miner intakes.
I wish I had some kind of over-hang over the windows, but I don't.
The third fan in the other window across the room is just a fan exhausting the hot room air. It is not so much of a concern as it's on the "dryer" side of the house and sheltered by trees.
In short, it's just me being safer than getting water in the miners and being sorry. It's just a risk I am unwilling to take. I usually rent a small-ish rental to cover periods of extended rain and just let my electric meter rest.
EDIT: I have investigated (and still looking) water proof or resistant screening. Something with smaller mesh even. But that would still not stop the water coming AFAIK. Any othe water-proofing solutions and ideas are gladly welcomed!!
Understood, makes sense now. My operation is in the basement, there would have to be some kind of pipe bursting catastrophic failure to get those miners wet
Hopefully the weather will pass quickly and let you get up and running again. 
