NBC SYSTEM AFU 600 device provides air conditioning of shelters and buildings and protection against adverse effects that chemical, biological, radioactive and nuclear strikes create. Working system of the device provides protection accordingly STANAK 4447 standard, protects by creating positive air pressure inside the place it is located with decontaminated and de-dusted air. The device is alarmed and it is possible to operate and control the system both inside and outside of the room that needs to be protected by its remote control. The air flow can be adjusted automatically according to the pressure inside the area that must be protected.