3. Filters can be left in the cassettes for shipping to the lab, but to m inimize sample contamination during
shipping, remove the filter from the cassette within one hour of completion of sampling and place it in a
vial to be shipped to the laboratory. Handle the filter only with gloved hands and nonmetallic forceps.
Discard the backup pad. As a precaution, it is recommended to ship the samples with bagged refrigerant.