Fire Risk in Mining Rigs?

[QuintLeo]

Technically, I'm pretty sure ALL drywall is fire rated - but the rating (normally given in hours) varies with the thickness.
Then there's concrete board (which is in my planning for MY shelf/racks as a seperator since the standard 3'x5' size is cheap and big enough to isolate each unit from the next).

[Cereberus]

It all depends on the place, I have put my last rig in an open air frame self built with dimensions in Cm as 80x35x40 (I know pretty big for a rig with 6 cards but I love it) and I have put it in an abandoned house in my building. The cards are running at 43 C max so I think I am pretty safe regarding fire risk. I always leave a window a few inches open so there is always airflow coming to the rig. Minimal dust also as no one lives in the house where the rig is going