These small snorkels are only for point sources like lampworking glass (chemists often call it glassblowing but it isn't), for soldering, and small torch welding. The larger snorkels will work for other types of welding, but they draw too strongly for chemical processes, will put out small flames and the like. Even inert gas welding can be a problem if the draw pulls the gas away from the weld.
The best is slot vented counters or benches that create a draw in a larger area. But that takes more air than most "green" oriented builders are prepared to process. The new LEED standards are often an impediment to providing healthy industrial ventilation systems. And in fact, LEED requires the design to be built to the newer ASHRAE 62-2007 standard that has cut the amount of air/person generally. My reports always recommend using ASHRAE 62-2001 for this reason. Does anyone remember the energy crisis in the 1970s? Hmmmmm?
In a message dated 10/12/2012 9:35:07 AM Eastern Daylight Time, simolo**At_Symbol_Here**CHEM..CHEM.ROCHESTER.EDU writes:
We have tried small snorkel type of setups before and they were terrible at capturing vapors from the setups the students need to use.
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