whew, looks like it's time to start building George. Good lord George let's get with it and come up with our own standards, like an air exchange rate or something to that effect instead posting obfuscation. You must have your own definition of "adequate ventilation" what is it? For me a building the size of a two car garage with no open doors isn't adequate, so I end up wearing a respirator when glassing with epoxy or varnishing. cheers