If a fan can oscillate left to right then it's junk because the gearing will always go bad eventually which means the gearing can become obnoxiously loud. When I say gearing what I mean what makes it oscillate, if you pull or push the plunger that disables the gearing, the clutch wears out over time and then the fan makes more noise that's arguably worse than what the blades produce when pushing air or worse than the actual motor.
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