I was touring some labs yesterday and noticed a variety of small benchtop m achines that were designed to do Polymerase Chain Reaction chemistry. Some of the references I reviewed on this technique listed a variety of hazardou s chemicals associated with this process (phenol, chloroform, etc.), but th ey are somewhat dated and I wonder if these machines use these chemicals. The immediate question is what level of ventilation these devices need. Fro m what I can see in the instrument manuals I downloaded, the ventilation ne eds seem to be limited to temperature control considerations, but I thought I would check with the DCHAS list to see if anyone has experience with che mical exhausts from these systems. Thanks for any help with this question. - Ralph Ralph Stuart CIH Laboratory Ventilation Specialist rstuart**At_Symbol_Here**cornell.edu
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