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M20 Protective EntranceNSN: 4240-01-283-0194 (S-280)
Application Statement:
Features:
The Hunter M20 is a transition enclosure, a protected entryway in which people pause for a specified period while entering to allow the purging of airborne contaminants introduced when opening the outer door. The main purpose of the M20 is to prevent direct vapor transport into the enclosure. In doing so, it also ensures that internal pressure is maintained continuously in the enclosure while entries and exits occur. The M20 is a ventilated airlock through which people enter and exit the Toxic Free Area (TFA) while airborne hazard is present outside the shelter. The airlock is purged by the flow of clean air. The air flows from the main protected enclosure (TFA), through the airlock, and out a discharge vent on the outer airlock door. Entry/exit is an important consideration for collective protection shelters. It includes both hardware (ventilated airlocks) and procedures for transitioning from individual protection to collective protection. Airlocks and entry/exit procedures are employed with military collective protection systems because of the need to continue operations while agents may be present in the environment. The M20 can provide the benefit of helping maintain pressures within a protected area to ensure continuous protection during routine operations.
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