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The bacterial and viral filtration performance of 12 breathing system filters was determined using test methods specified in the draft European standard for breathing system filters, BS EN 13328-1. All the filters were of two types, either pleated hydrophobic or electrostatic, and these two types di
## Summary The filtration performance of breathing system filters can be measured by challenging the filter with sodium chloride particles. However, the challenge itself may alter the filtration performance. This effect was determined by repeating a standard challenge test five times on one sample
A direct universal extended H system receives as input the coding of an extended H system with a particular control mechanism and simulates it. We present a direct construction for ΓΏve kinds of control for the extended H systems under consideration. It is the ΓΏrst time that a direct construction is