Electric fan

300cfm? I hope that’s a typo. Should be more like 3,000 cfm.

All depends on the draw from the fan. It’s not unusual for fans of the right size to pull 40 amps on start up. That’s a short term problem of course, the running draw is lower. If you’re running all the accessories though 60 amps can go away pretty fast. People have done it, it’ll just depend on how much the fans run and how many other accessories you’re running.