The use of mineral wool should include covering the mineral wool so fibers, etc. don't get sucked into the fire box and through the cooking chamber. I've worked with it professionally and it gets everywhere. Wear a mask when working with it.
Am I tough? Am I strong? Am I hard-core? Absolutely.
Did I whimper with pathetic delight when I sank my teeth into my first brisket? You betcha.
Chargriller Pro w/SFB 3 generic digital thermometers