![]() After this, the user can now don the mask and it will provide the protection offered by the filter used. A blanking plug is also provided which the user must mount on the unused filter port. Once this is mounted, the user can now screw-on GP-7 or GP-5 gas mask filters on the adapter. If the user wants to use a 40mm GOST filter or an older PMK-1 filter, then he/she must take the provided plastic 40mm adapter (part of the kit) and mount it on the selected port. If the PMK-3 filters are to be used, then the user will simply mount the PMK-3 filter on the preferred side of the mask. To use the PMK-3, the user must first select the preferred filter type. The advantage of this was that the PMK-3 would be able to use two different kinds of filters however, because of design limitations, mounting the filter ports on the mask requires a lot of effort (it uses friction to form a seal and no glues or adhesives) and filter changes are difficult and most require the user to remove the mask if using the proprietary new-generation Russian PMK-3 filters. The solution was to have a detachable adapter connector for 40mm GOST filters and an open port to accept the new generation Russian filters. This meant that the PMK-3 gas mask had to be able to use two kinds of filter interface connectors on either side. In addition to this requirement, the arrival of the new generation PMK-2 and 3 filters (needs citation), which provided improved protection in a smaller package, caused a design turn as the new generation Russian filters used a proprietary connector. Unlike most masks which use two readily-installed filter ports on both sides, the PMK-2 and PMK-3 were required to be backwards compatible with older Russian filters and have the capability to mount 40mm GOST filters. The Russians, designed their new masks to have detachable ports which will be installed by the user based on preference. Due to the PMK-1 having the capability to mount filters only on one side, the PMK-2 and the PMK-3 were designed to mount filters on either side to accommodate left-handed shooters. The mask is designed to protect against CBRN threats and is an improvement over the PMK-2 and PMK-1 gas masks.ĭuring the 1990s work began on a project to replace the PMK-2 gas mask which was the current-issue gas mask of the Russian army. ![]() The PMK-3 is the current-issue gas mask of the Russian Federation Armed Forces (as of 2013). ![]()
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