Face Shield Big Enough for Respirator?

I don't mean to wake this one up if it's been asked and answered but Benchmark Abrasives sells something they call the "Grinder Hood" which is basically a face shield designed to accomodate cans and a half mask. I have one and love it. I love my full face mask for some applications as well but it's a pain to take off and on when I just need to squint and inspect a weld real quick.
 
That looks great. What kind of respirator is under it?
 
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