In one set of measurements, the values of ∆P used are 200, 500, 700, 1000, 1200, 1500, and 2000 mbar. For this "Batch 1", R H = 80 ± 5 mbar•min•µL -1 for all devices used. We duplicate the entire set of measurements in a "Batch 2", using ∆P = 200, 500, 700, 900, 1200 and 1700 mbar. For Batch 2, R H = 75 ± 6 mbar•min•µL -1 for all devices used. Furthermore, the particles used in the Batch 2 experiments come from a separate batch obtained from the same supplier (Bangs Labs). In Batch 2, there is a slight reduction in the total number of clogs. This may be due to the ∼ 6% decrease in R H combined with the different batch of particles. However, the qualitative behavior and conclusions regarding clogging remain the same.