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The best luck we have had with fans are the really old 20's or so Robbins and Myers and also Vornado fans. Once rewired, the performance is very good: the motors on these are high quality and also the blade design moves a lot of air.
There is actually a Lakewood metal blade box fan still being made and it has worked good so far. It is a heavy duty model with a grounded plug. Have not had great luck with most types of box fans, though, even the older ones. There are no oil ports and the motors use Oilite sleeve bushings so after a while of continuous use, the lubrication runs out and the bearings score and that's it. Even if you try and relubricate it, the bushing is damaged and it will seize again.
I think my record for a box fan is 8 years of continuous use, never shutting it off except for power failures.
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