That says the wrong engineer installed or designed the system. If the ducts were round with no right angle bends, and were sized for a 4000 l/m centerline velocity as ACGIH recommends, there would be no deposition. A lot of these desk-sized systems available off-the-shelf are not even close to good design. Monona
In a message dated 9/21/2010 9:19:27 AM Eastern Daylight Time, kauletta**At_Symbol_Here**NOTES.CC.SUNYSB.EDU writes:
The biggest problem I had with silica control in our dental school was cleaning out the local ventilation system. I had them get the small HEPA vacuum (the real kind) and that made a big improvement.
Kim Auletta
Lab Safety Specialist
EH&S Z=3D6200
Stony Brook University
kauletta**At_Symbol_Here**notes.cc.sunysb.edu
631-632-3032
EH&S Web site: http://www.stonybrook.edu/ehs/lab/