Looking for suggestions on securing drum fans to a roll up garage door. The fans will be ventilating bitcoin miners within the room. Naturally that makes me worried about security, as the garage doors would always be "open" with the fans underneath them. I'm not looking for a solution that would allow me to pass under the door as I will have a second door to enter/exit from, so it doesn't have to be able to easily be taken apart. What first came to mind was some sort of heavy metal chains that I would simply weave through parts of the fans, securing the chains to the door, and the ground. I'm sure there are better solutions than that, but I haven't been able to come up with any.
I'm going for this type of solution, but it must be more secure than simply setting some fans under the door, rolling the door down to the top of the fans, and hoping it doesn't get broken into. All suggestions are welcome!
