The fan is fairly quiet.

Never failed with running a fan, charging phone and laptop and even a small air compressor out of my van

All this doesn't even turn of the cooling fan except for the initial surge at start up.

Product works well for running a small vacuum cleaner to vacuum out the car, a portable refrigerator, outside fans, a blender (yes a blender), two laptop computers, and a power drill and saw

When I connected them together I could hear the cooling fan running, but the outlets never delivered the collected power

As others have noted, the cooling fan runs 100% of the time while the device is on

fan is quiet only gave 4stars because no audible alarm

it works as it says it should.

Works as I expected.