Ventilation systems offers perfect air quality and circulation for gun rooms, ammunition protection and storage. They are designed as well to protect from nuclear, biological and chemical pollutants. They consist of the ventilation unit (VA), which draws in outside air via the explosion protection valve with prefilter (ESV-VF). If the breathing air is contaminated, the NBC filter is switched on and the required air volume is regulated by the air flow meter. He combined NBC protection filter from LUNOR prevents the penetration of radioactive dust, biological germs and chemical pollutants into the gun room . The contaminated outside air passes through the HEPA filter and then through the gas absorption filter (made of activated carbon).