George is good at stirring up the fires, which in the long haul (hull) is good for us all. We need him. There's been more than once when I agree with his viewpoint, but posting a more tactful message doesnt generate the discussions that he does. And discussion is what we are about here. That said, let's do draw the line at direct insults, shall we?

My definition of "adequate" is that if I can smell the fumes, it isn't. I'm in a 35 x 40 shop, and will have the slider door open if I'm glassing. For little batches, I use the radial arm saw hood, which exhausts outside. In general industrial ventilation (which is what we do - see www.benzco.com) "adequate" means keeping a clean airflow across the breathing space of the occupant. This may be a hood, or a source-capture arm, or an air change. If the latter, I'd suggest a 5-minute air change at least. If you can arrange it so the fresh air comes across the breathing space, then you can get by with quite a bit less. All the source-capture arms run in the 500-600 CFM range. For a commercial builder, this might be a good alternative to the respirator. See the Nederman link from our manufacturers page. A 7' arm on a standard bracket, with a fan, runs in the $1700.00 range. A boom for it is quite a bit more than that.

: 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