Goal of this Post: Choose a tub to use for the fume collection.
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Now that I've rearranged my area, I'm adding real ventilation.
I'm on a Bravo in a garage. I mostly use the center-fire, but do fire up the outer now and then. The desk I torch on is 30" deep with the torch mounted at the very front. The back of the desk is open, ie. no wall behind it. The torch is angled slightly upwards, but I'm open to changing the angle if needed.
The space behind the desk is a walkway so I can't impede it too much.
I've decided to go with a washtub at the end of the ductwork as the "fume hood". I'm trying to figure out which kind to go with.
My choices appear to be a round tub or a pill shaped like Mary did in her studio build:
LE Thread:
http://www.bluebetween.com/studio.htm
Personal Site Thread:
http://www.bluebetween.com/studio.htm
My mind tells me that the pill-shaped tub situated so that it hangs long-ways going front-to-back makes the most sense since I won't have a backsplash. If the fumes and crud were rising in a perfect circle, I'd say the round tub, but the movement of air away from the face of the torch makes me think the pill-shaped one is best.
Crude image of what I think makes sense - position of the tub will be based upon fume tests, this is just a general pic so you can see what I'm talking about
:
What do you guys think on this? Lowering the back of the tub some may help, too.
I will, of course, do all the proper tests after I have it set up to make sure it's getting all the bad air. I've read a lot in this forum so I'm cognizant of what duct-work to get, what fans to look at, where to go for the CFM calculator, etc. This one decision is holding everything up and I don't want to have to buy multiple tubs because I made an illogical decision.
So: Which tub shape should I get and why?
Thanks,
-BEP
Examples of what I'm talking about
:
Round Tub
Pill-Shaped Tub: