Lost power the other night around midnight, started generator which is in it's new shed. At 0330 I woke up and could see power was on, went out to shut it down. Output fan had failed and was melted, whole enclosure was hot, could have burned down the shop. I tested this set up, not sure what happened, two Lasko fans, plastic grate and blade, maybe need to get all metal or run exhaust out of container with RV pipe extension.
Surplus center has metal ones. I thought you did run the exhaust out? Get a extension somehow and wrap it with header wrap. You got lucky. I would add a simple temp switch to shut it down if it gets X hot. No idea what that would be.