Some enviorments such the factory is easy to generate some gas that maybe harmful, and you would definitely need the portable ventilator to solve this problem.
The portable ventilator is quite useful. Not only in factory, sometimes maybe you could use the portable ventilator while getting your room re-painted. Or you may thanks to having a portable ventilator while something burn out in the office or at home.
For me, I am eager to have a portable ventilator while my colleague just messed up his meal in the micor stove and whole office is full of burning smell. Maybe all these situation wouldn't happen every day, but it's better to have one of your portable ventilator just in case,right?