Figure 2. Flow resistance vs. UVGI dose for respirator material. (A) 3M 1860; (B) 3M 9210; (C) GE 1730; (D) KC 46727. Each pair of bars shows the mean flow resistance for four 37 mm test coupons before and after UVGI exposure. The units “mm H2O” are used by convention; 1 mm H2O = 9.8 N/m2. Error bars show the standard deviation.
