What is the difference between the Draft BS EN 13328‑1 bacterial and viral tests, and the BS EN ISO 23328‑1 test?
Draft BS EN 13328‑1 determines filtration efficiency using viruses and bacteria to simulate real‑world results. The chosen bacteria and virus pathogens used for the F&P tests are relatively small and mimic pathogens of clinical significance. They are also stable both in liquid suspension and when aerosolized.
The BS EN ISO 23328‑1 test uses tiny salt particles to test filtration efficiency and provide a standardized test for comparing different filters. However, this test does not specify the testing conditions; instead, the manufacturer determines these. F&P conditioned our filters for 25 hours using heated and humidified gas to simulate 24 hours constant use in a ventilator circuit.
If selecting a filter from another manufacturer, compare filtration efficiency using BS EN ISO 23328‑1 and ensure it is tested under heated and humidified conditions.