With a plastic blade? Yah, you can. The plastic is very light and has very little momentum behind it, despite the speed. I calculated that a 20" box, 1000rpm f

With a plastic blade? Yah, you can. The plastic is very light and has very little momentum behind it, despite the speed. I calculated that a 20" box, 1000rpm fan blade moves at around 50 mph. Those large ones might hit pretty hard but will not cause serious injury. I think he's talking about a small 8 inch desktop model, going maybe 500rpm - that's only 7mph.