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Old 2013-09-14, 10:52pm
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cheng076 cheng076 is offline
Curmudgeon Engineering
 
Join Date: Feb 15, 2006
Location: Near Seattle, WA
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I see a couple things that may be effecting your system.

The idea of ventilation is not just to collect the flame gasses and exhaust them out of your immediate area but it is to draw an amount of clean air around your head so you have fresh air to breath.

What I see from your photos is that the 'hood' is shaded by the baffel that hangs down and is positioned in front of the makeup air stream such that the curtian of makeup air that should come up from below the bench is greatly agitated by the stream of air from the 6" duct shooting into it as it tries to rise up. This agitated air is then drawn toward the hood in a manner that it has to flow around the hood's back baffel causing even more agitation and possibly your dancing flame.

Try moving the 6" duct to the side of the bench and bending it sideways so the MU air flows into the area between the bench and wall horizontally from the side. Cut 6" off the bottom of the curtian under the bench so some air flows under the bench toward your body as you sit at the torch. It doesn't take much. Then remove the baffel that is attached to the back side of the hood opening.

What you have done, based on your pics, is to introduce a very agitated MU air stream that is also restricted and forced to distort even more to enter the hood pickup area. The configuration leaves no way for the air flow to entrain room air or even MU air from a door or window and exhaust it outside.

Hope this helps, PJH

Last edited by cheng076; 2013-09-14 at 10:56pm.
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