great video!!!! and your ventilation looks like it is working well. one thing i would suggest is if you do another smoke test. place the smoke bomb at the same level and near the end of the torch and have hole pointed back where you sit to lampwork. the smoke plume will be forced backward to get a situation similar to what i was describing in the back flow thread. your funnel design is much better than most that i have seen here at LE. good job on your ventilation and the cool smoke bomb videos.
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Mark Wilson
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