Burnet - We have redundant everything, yada, yada, yada...
I have a 4' fan on wheels tucked away in a basement behind stacks of boxes and crap JUST IN CASE.
Open the door and turn on the fan it will help.
Run to Home Depot / Lowes and pick one up. Only a couple of hundred bucks.
if your using blades - your toast (pun intended)