Brian - I'm looking to control smoke and fumes during component and other abnormal conditions, as well as UL 94 testing.
Lots of food for thought. Thanks. Regards, Peter Tarver > -----Original Message----- > From: Brian Oconnell [mailto:oconne...@tamuracorp.com] > Sent: Friday, June 20, 2014 16:49 > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Exhaust fume hood recommendations > > My boss immediately said that below was a Freudian slip. > Should have been " You would probably not get this additional > functionality on the stuff intended for chem or bio labs." > > Brian > > -----Original Message----- > From: Brian Oconnell [mailto:oconne...@tamuracorp.com] > Sent: Friday, June 20, 2014 4:37 PM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Exhaust fume hood recommendations > > My current hood is stainless steel, with a large bubble in > the exhaust tube just above the hood. The bubble has fans > fore and aft. The bottom lip of the hood is used to hang > Lexan 'shields' on three sides; this is because I wanted them > removable so that I can also use the underlying bench as > normal test area when not torturing stuff. The back wall > surface is covered with a sheet of galvanized metal and has > latches for the lexan shields. > > Unless you run a very well-sealed hood area, fans must have a > high volumetric rating. In any case, doubt that even the fans > for a large computer would suffice for any type of setup. > Fans for my hood are rated 120V or 208V, direct drive, fused > and rated at least 500 cfm, and not anything special and are > mounted to be easily replaced (seem to be replacing them > about one per year), so do nothing for filtration, just vent > the smoke to the outside smog. If the vent stack is very > short, there could be a possibility of the exhaust having > burning embers. Most commercial hood setups use a venturi or > are centrifugal so can be difficult to service and replace. > Look at fans in the Dayton or Grainger catalogs for ideas - > decent exhaust fan assemblies will be at least $250 USD. But > the commercial lab stuff is an order of magnitude more > expensive. My set up is also useful for the Type Test on end- > use equipment that could cause smoke emissions. You would > probably not get this additional fun! > ctionality on the stuff intended for chem or bio labs. > > If you want a portable setup to exhaust a small area just for > UL94 stuff, build a metal box, about 1 cubic meter with inlet > louvers at bottom, and use a bathroom exhaust assembly on the > top. > > Or you could just put a steel bench in the parking lot behind > the building... > > Brian > > -----Original Message----- > From: Peter Tarver [mailto:ptar...@enphaseenergy.com] > Sent: Friday, June 20, 2014 3:45 PM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: [PSES] Exhaust fume hood recommendations > > Hi. > > I'm doing some research and am looking for recommendations > for fume hoods > for abnormal condition testing for my lab. I have an > opportunity to have > an exhaust to outside air system and am looking for your > thoughts on what > has worked well for you in terms of cfm capacity and which > manufacturers > you've used. > > I'm thinking of a variable speed or at least multiple speed > fan. Product > types range from about the size of desktop feature phone to a > large tower > computer. I will likely also use the fume hood for > flammability testing. > > I'm not interested in recirculating air types, since the > filters can be > expensive. > > Any insights you can give are solicited, even modifications > you've made to > improve performance or usability. > > > Regards, > > Peter L. Tarver > > - > ------------------------------------------------------------- > --- > This message is from the IEEE Product Safety Engineering > Society emc-pstc discussion list. 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