Evaluation of decontamination methods for FFRs 817 used to further optimize the decontamination methods and/or explain some of the findings from the observational analyses or laboratory performance evaluation experiments. Dry oven experiments. To investigate the effects on filter aerosol penetration at various dry heat temperatures and to determine if these effects were similar to those of FFRs that underwent microwave oven irradiation, new FFRs were placed in a Fisher Scientific Isotemp 500 Series laboratory oven (Fisher Scientific, Pittsburgh, PA, USA) for 1 h at temperatures ranging from 80 to 120°C. Filter aerosol penetration was measured after samples cooled to ambient temperature.