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We just installed an HF hood with plastic ducts and fan parts, etc. No scru bbers or filters though. You might check with Sentry or Captair and check t heir ductless fume hoods to see if HF is an acceptable application. I have heard the filters are expensive and you must be prepared to change them at the appropriate time. The other option may be to use a Parr bomb with a Tef lon liner. Chris -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Jo seph Passante Sent: Monday, November 30, 2009 9:41 AM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: [DCHAS-L] HF digestion safety Does anyone on this list have experience with proper exhaust design for small scale digestion using 48% HF? The geochemistry researcher I am working with anticipates evaporating 2 liters of concentrated HF per month in a fume hood. I am interested in scrubbing technologies and if anyone has designed local exhaust systems that do not involve a fume hood. Thanks Joe Joseph R. Passante, CIH, CHO Associate Director Chemical Hygiene Officer Environmental Health & Radiation Safety University of Pennsylvania 215.746.6550