From what I think I read, Optrel cheaters are proprietary for their helmet, and only go to +250. My 3550 helmet takes the generic rectangle ones, and I found +350s from China.
The PAPR is a HEPA filter with fan that you wear around your waist. It blows filtered air into the helmet. For most things I do I would just like a big face shield. Here is the 3M with just a face shield:
For what they cost, however, I'd like to have the option of using it for welding as well. The price difference for a flip up SpeedGlass version isn't that much.
Miller and Lincoln make comparable designs. I've hear great things about the Optrel welding helmets. I just don't know if they are clear enough to be usable for woodworking and grinding?
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