My boss and the VP of Operations are aware I mine BTC. I think my boss is curious and kind of kicks himself for not buying some when they were under $1,000.

I have thought about a couple miners at work but there really isn't a place where I could get good ventilation and air flow in and out.
The server room, where I work, is kept chilled by AC, but I think any miners in there would quickly raise the room temp. The six servers and two workstations in there don't put out too much heat (amazingly). At least not as much as a few miners.