OK!! Almost done, yay! Just some tidying up, put in some kind of light, double-tape the plenum outside, stuff like that. It works great, and is VERY quiet, so that's wonderful!
I believe that if I open the other ceiling vent in the main shop area, it will improve the draw a bit, and also will be partly using that air rather than only heated air, so I think it may be that I don't need a separate, closed-off makeup air supply. Will see about that once I get busy and put in a decent session at the torch. I have a couple of ideas about that if it is necessary.
I didn't use a smoke-thingy yet to test, but all fumes, ash and odor from a burning paper towel held where the torch flame will be went right up into the duct; I didn't detect any smell at all from just behind the torch where I'll be standing or sitting.
Here's a pic, and if I can help anyone in any way who's still working on this stuff I'd be more than happy to try! And MANY thanks to you guys who've stuck with me and helped in so many ways. Your generosity with time and expertise is just so amazing.
I'll report in again when I've actually started torching. Might be a week or two; have a few other things demanding some attention, and a few essentials yet to obtain.
Thanks again, guys. I owe you! If I can't do anything for you, I promise to pass it on!
Judy