Breathability Testing
Since we began testing the filtration performance of different materials, one question that has come up is breathability. How much effort is required to breath through the material? If the material is very good at blocking particles, if it is too difficult to breath through that is makes it not useful.
The approximate basis for our test setup was this paper. However, with several simplifications because we could find a stable particle generator that didn't saturate our particle counter. We also didn't have large sample of all materials that were flat can could be wrapped over a large port.
Below is a schematic of our breathability test setup:
