Big Carbon Bed – several inches thick.  We’ ve had good luck with downdraft necropsy tables that run the exhaust through a really thick carbo n bed - >12”, if memory serves.  We were able to show that the formaldehyde was captured on the carbon bed using an exposure dosimeter, both in the air stream out of the filter and on the humans in the space.< /p>

Hope this helps.

Debbie

------------------------

Debbie M. Decker, Campus Chemical Safety Officer
Environmental Health and Safety
University of California, Davis
1 Shields Ave.
Davis, CA  95616
(530)754-7964/(530)752-4527 (FAX)
dmdecker**At_Symbol_Here**ucdavis.edu
Co-Conspirator to Make the World A
Better Place -- Visit www.HeroicS tories.com and join the conspiracy

We have a researcher who would like to occasionally vent small quantities (micrograms/cubic meter; maybe less) of formaldehyde from a vessel being developed to measure greenhouse gases.  Because the vessel sits on a laser table, and there is no fume hood in the laboratory, we are hesitant to tell him to vent it into the room (especiall y since the building is old and there is very little turnover of the air in t he room).  I’d like to find a filter for the exhaust before it goes outside, but have had trouble finding an effective filter.  I know that activat ed charcoal is not very effective for such a small molecule.

What do you use to filter formaldehyde from exhaust?

Sonja Ringen

Office of Safety, Health and Environment

NIST/Boulder

325 Broadway, MC 173.02

Boulder, CO  80305

Phone: 303.497.7389

Mobile: 303.961.9251