CBRN / NBC Filtration Systems for Shelters and Protected Facilities
Atmas offers a wide selection of standard and customizable CBRN (chemical, biological, radiological and nuclear) / NBC air filtration and emergency ventilation systems designed for installation in protected spaces like safe rooms, civil defence shelters, bunkers, containers and facilities for providing fresh filtered air for safe breathing, maintaining of overpressure and creation of protected environment in the intended area.
Sistema di filtrazione SAFE 360 CBRN / NBC
Sistema di filtrazione SAFE 360 CBRN/NBC con backup manuale per piccoli rifugi, bunker e camere di sicurezza con volume d'aria fino a 36 m3/12 persone
Sistema di filtrazione CBRN/NBC ARC 50
Sistema di filtrazione ARC 50 CBRN/NBC con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 50 m3/16 persone
Sistema di filtrazione CBRN/NBC ARC 100
Sistema di filtrazione CBRN/NBC ARC 100 con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 100 m3/33 persone
Sistema di filtrazione CBRN/NBC ARC 180
Sistema di filtrazione ARC 180 CBRN/NBC con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 180 m3/60 persone
Sistema di filtrazione CBRN/NBC ARC 240
Sistema di filtrazione CBRN/NBC ARC 240 con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 240 m3/80 persone
Sistema di filtrazione CBRN/NBC ARC 300
Sistema di filtrazione CBRN/NBC ARC 300 con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 300 m3/100 persone
Sistema di filtrazione CBRN/NBC ARC 450
Sistema di filtrazione CBRN/NBC ARC 450 con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 450 m3/150 persone
Sistema di filtrazione CBRN/NBC ARC 600
Sistema di filtrazione CBRN/NBC ARC 600 con backup manuale per rifugi, bunker e camere di sicurezza con volume d'aria fino a 600 m3/200 persone
Sistema di filtrazione CBRN/NBC ARC 900
Sistema di filtrazione ARC 900 CBRN/NBC per grandi rifugi e bunker con generatore di riserva e volume d'aria fino a 900 m3/300 persone
Sistema di filtrazione CBRN/NBC ARC 1200
Sistema di filtrazione CBRN/NBC ARC 1200 per grandi rifugi e bunker con generatore di riserva e volume d'aria fino a 1200 m3/400 persone
Sistema di filtrazione CBRN/NBC ARC 1800
Sistema di filtrazione CBRN/NBC ARC 1800 per grandi rifugi e bunker con generatore di riserva e volume d'aria fino a 1800 m3/600 persone
* The shelter air volume and air change per hour (ACH) calculated according to one complete ACH. In some standards minimum two ACH is required.
In selection of the systems beside the parameter of air changes, other parameters should be taken into account like number of people in the shelter, national or local standard for air volume per person, additional components of the shelter like airlocks, generator rooms, air distribution and leakage.
We recommend to contact us for support in selecting the correct system for a specific shelter.
Sistemi di filtrazione CBRN/NBC e ventilazione di emergenza per rifugi, bunker, camere di sicurezza e strutture fisse
General Points for Selecting the CBRN / NBC Filtration System
Unlike most products that degrade with use over time, a CBRN air filtration system is expected to remain on standby for years—possibly decades—without being used, and yet perform flawlessly the moment it's needed. Whether facing nuclear fallout, chemical agents, biological contaminants, wildfire smoke, or industrial toxins, the system must deliver clean, safe air into a sealed environment with zero margin for failure.
This unique requirement demands careful evaluation of both the manufacturer and the system’s specifications to ensure reliability under extreme conditions.
Why Choose Arconik CBRN Filtration Systems?
Arconik, a trusted global leader in CBRN filtration, produces over 10,000 systems and filters annually. Subject to frequent quality and procedural audits by governments and third parties, Arconik’s products are certified and recertified yearly, undergoing rigorous performance testing. With systems ranging from 36 m³/h to over 1,800 m³/h and fully custom setups for larger airflow requirements, Arconik offers tailored solutions for any shelter size.
Step 1: Determine Your Required Airflow
1. Airflow per Person
Estimate the total airflow by multiplying the number of occupants by the airflow needed per person. Common standards recommend 3–6 m³/h per person, with 6 m³/h per person preferred for civil defense or private shelters, especially in warm climates. Military shelters may require up to 17 m³/h per person, due to higher activity levels.
Example: 50 persons × 6 m³/h = 300 m³/h
2. Air Changes per Hour (ACH)
ACH reflects how many times the air inside the shelter is completely replaced each hour. Multiply the shelter’s internal volume by the desired ACH. For private use, 2–6 ACH is recommended, with 1 ACH considered a minimum.
Example: Shelter volume: 200 m³ × 2 ACH = 400 m³/h
3. Leakage and Exhaust Compensation
To maintain positive pressure (typically 100–250 Pa)—which prevents contaminants from entering the shelter—you must account for leaks and exhaust airflow (e.g., through toilets, kitchens, airlocks). It's advisable to pressure-test the shelter pre-installation. If this data isn't available, include a 25% safety margin.
Example: Measured leakage + exhaust = 440 m³/h Add 25% margin = 550 m³/h
4. Airlocks or other filtered fresh air consumers
Adding an airlock in the shelter usually require additional amount of fresh filtered air as in some cases more 50 air changes per hour may be required to "flush" the airlock from contaminated air.
Additional consumers of fresh air may be generators if installed inside the toxic free area and other equipment that require air or oxygen.
Step 2: Select the System
From the three calculations above, take the highest value—in this case, 550 m³/h—and select the next available system size that meets or exceeds it. For example, the Arconik ARC600, rated at 600 m³/h, would be appropriate.
Always opt for a buffer above your minimum requirements. Over time, aging seals, structural shifts, or external damage may increase leakage, especially after explosive events or long periods of disuse. Built-in redundancy is essential. A manual crank backup is critical to ensure functionality during power outages.