Thanks. I may be overthinking this. I thought about a single 100 amp fuse but I would like to avoid a single point of failure. One fan working is better than no fans
The only real problem I have with that is that it would take 100 or more amps to blow it.
That would toast wires before the fuse blew.
You might consider one 30 amp resetting breaker for each fan, as IF it tripped one of those for some reason it would come back on in a few seconds and the other fan would stay running until it did.
The breakers can handle more that they are actually rated for, for a short time before they trip but a constant high draw would trip it just like a slow blow fuse.
BUT, slow blow fuses don't come back on again.:D