Air filtration system NBC

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Overview
NBC filtration protects naval vessels operating under threat from TICs and TIMs. NBC filter systems equipped with STANAG4447 composite elements, used together with overpressure controllers, create a pressurized protected zone (citadel) to prevent contamination of crew and onboard electronics. Units cover a capacity range of 900–1800 m3/h.

How it works
Three filtration stages treat incoming air before supply to the citadel:

• Coalescer filtration
• Dust (particulate) filtration
• Composite filtration (STANAG4447 filter elements)

Filtered fresh air is delivered under overpressure to the citadel so personnel do not need gas masks or protective suits during NBC incidents. Two operation modes permit normal (peacetime/conventional) ventilation and filtered supply for NBC warfare.

Design and safety features

• Control system continuously compares inside and outside pressure and provides visual and/or audible alarms if citadel pressurization fails
• External unit design for installation on the ship hull with a supply duct to the citadel interior
• Separate internal NBC control unit for diffusion and local control of supplied air
• Fail-safe airflow: in case of damage or seal leak, clean air leaks out rather than contaminated air being drawn in
• Integration with overpressure controllers to maintain citadel safety and protect personnel and electronics

Technical data / specifications

• Capacity range: 900–1800 m3/h
• Filter elements: STANAG4447 composite filter elements
• Filtration stages: coalescer, dust, composite
• Overpressure controllers for citadel pressurization
• Control system: inside/outside pressure monitoring with visual and/or audible alarm
• Installation: external unit with supply duct; separate internal NBC control unit for air diffusion
• Operation modes: peacetime/conventional and NBC warfare (filtered fresh air)
• Fail-safe airflow design to prevent ingress of contaminated air