I have a question related to lasers, my brother bought a 3W(Very dangerous stuff, a class 4 laser) that works on a wavelength of 450nm(blue light) laser engraver and it has already been tested on another place but it's back at my home now. The device works now the only issue I managed to get was it lacking another fan.
My question comes here, you see, I have told him to do some extra work on it before using it, doing an enclosure on it, a stable and safe place on which to use it, the actual planned place right now is too idiotic to mention, back to the main point, just how unsafe am I with this thing home.

I won't be operaring it, so my danger of exposure comes from 4 factors

>BEING AROUND THE LASER ENGRAVER (3W/450nm) IN A NON EMERGENCY SETTING
If I stay in my room locked, and light has no way of getting in since I barricaded myself with tape, a towel that obscures an opening, the usual opening below the door, and putting a mattress against the door.
Am I safe from
>light?
>hypercharged photons?
>fumes?
Or could I get either eye damage or lung damage from it?
The other 3 factors will be detailed below