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Regarding how many filters you need for a respirator/gas mask, one single filter is not enough, you need at least one open training filter, so you can test that the mask works properly, train to use it and build confidence with your mask. You also need at least one sealed and in-date filter for actual use in a NBC emergency. Relying on the open filter is a bad idea as if it has not already expired it will not last long when exposed to harsh chemicals. Ideally you should have several in-date and sealed filters in case they do not last long enough for you to evacuate a contaminated area properly. If you are simply using the mask against particle threats you do not really need to worry about filters expiring, as particle filters last decades unless damaged or used frequently. Support me on Patreon / weaponsandstuff93 Please comment, rate and subscribe for more. Follow me on Facebook and Twitter for updates: / weaponsandstuff93 / weaponsstuff93