I would say nearly impossible (basically impossible to keep balanced but i won't say totally impossible)
I actually work for a company that makes plastic auto fans.
The best you could do would be to trim them in a lathe. Even then I think you'd have a tough time. those fans are often made from nylon with glass fibber or mineral fillers for strength which makes them very brittle if you're lucky it is made from polypropylene but not likely. but that would also have glass or mineral fillers
Might be easier to go to a pick-and-pull junk yard (auto or tractor) and find a smaller fan that would work.
someone asked why the blades aren't evenly spaced: =its for noise reduction
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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