What is the out of danger lifespan of an electrical lover. Are the older fan ie. fan used within factory?

as big as say one of those antediluvian tv sets legal. Could they be sending out piles of dust etc.What is the out of danger lifespan of an electrical lover. Are the older fan ie. fan used within factory?
I used to work somewhere drastically hot the big fans we have were hired. The hire company would come surrounded by and service them.
Sometimes they would blow dust when they were turn on precipitate in the light of day
I would think a tentative fan would blow as much dust around as an outdated one, the dirt in the upper air that goes into the blades is like as what is going to come out the front of the blades either agency. I have used lots of ripened fans contained by my day, and I don't know of any basis to stop using one until it just quits and won't run anymore. I have it in mind, what's the worse that can happen? (The exception is mature electrical wiring - I would stop using a lover that has a frayed cord or if you see any sparks surrounded by the motor.)