The blades have a hard time turning
Clean the gunk in the motor and then oil it with zoomspout or the blue can 3-in-1 oil.
Probably requires cleaning- take the grille off, pull the blade free (most pull straight out- some have a pin/socket deal right behind the blades that need to be removed first) and clean out any gunk you may find inside. Be sure to unplug it first. before replacing the blade, turn the shaft with your hands to see how it moves; you might want to grease it with an electricity friendly lube of your choice. If it's still hard to turn, it may just be this fans time; box fans are cheap, and made cheap, and the wear-and-tear adds up.
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