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The pre-filter provides maximum protection by capturing airborne contaminants before they reach your protected premises.
Blast-protection valves with pre-filter ESV-VF 3 are used in air inlets of civil defense rooms, military facilities and industrial buildings to exclude the destructive effects of all types of explosions. The valve and the pre-filter have been tested and approved by the Swiss Armament Technology and Procurement Group and are designed in accordance with the guidelines of the Federal Office for Civil Defense.
Upon request.
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