[Grimburger]

I have a large fan at home that I remove the front protector from because it gets dirty often and is quieter.

My young nephew shoves his hand it in all the time for fun with zero harm.

[somehnguy]

On the flip side, a few of my hobbies include devices where the fans are usually exposed - and I've cut myself a handful of times because of it.

It's very size/shape/rpm dependent.

[Sarkie]

"It doesn't affect me, so it cannot be an issue"

[jabroni_salad]

Big fans are at a relatively low RPM, and household fans might be made with kids sticking their fingers in them in mind. I've got a little noisy desk fan with metal blades in it that I would prefer not to take my chances with. I've also cut myself on my RC Plane's props a few times.

[mellavora]

zero harm to him or to the blade?