NBC Air Filtration Systems
Safe Cell NBC Air Filter
An NBC air filter takes air from outside a safe room or bomb shelter, draws it through a series of particulate and gas adsorption filters, and then introduces the filtered air into the protected space at a higher pressure than the outside air pressure. This is called overpressure. This ensures that all air is flowing outward through any leak points and airborne toxins cannot migrate into the shelter.
- We manufacture the best selling NBC air filtration system in America with thousands of installations
- Protecting the most critical part of your shelter – the air you breath
- Two sizes – rated for up to 12 people or up to to 24 people
- Every Safe Cell runs off of standard 120 volt AC household electricity and comes with a 12 volt battery backup power cord
- Everything works together – blast valves, backup hand crank, connection kits, ventilation pipes, and more!
Safe Room and Bomb Shelter filtration systems
These include one Safe Cell with a full bank of filters and all the mounting hardware, two blast valves, one overpressure valve, one backup hand pump or hand crank, and a separate blower for ventilation. They are intended to be installed in an underground steel or concrete shelter.
Shelter in Place filtration systems
These include one Safe Cell with a full bank of filters and all the mounting hardware. They are intended to be installed in homes for sheltering in place.
Number of people
Corps of Engineers
Number of people
Battery backup system
Complete bank of filters
Wall mount, intake hose,
electrical cords, manual
Why you need an NBC air filtration system
In your home, safe room, or bomb shelter, there is no substitute for a broad spectrum overpressure air filtration system with redundant backup systems:
No substitute – gas masks, bottles of oxygen, carbon dioxide scrubbers, and duct tape and plastic won’t keep your family breathing for several weeks or months. You need a specialized filtration system designed just for the threats we face today.
Broad spectrum – from radioactive fallout particles to to VX nerve gas, the Safe Cell’s nuclear grade HEPA filter and the special carbon blend optimized for radioactive iodine handle any airborne threat.
Overpressure – this means more pressure inside the safe room than outside of it. The air flows outward through any leaks. This continuous flow of air prevents toxic laden unfiltered air from entering your protected space.
Redundant backup systems – if the grid goes down or becomes unreliable, having backup systems inside your safe room is invaluable. Every Safe Cell can run on a 12 volt battery and every Safe Cell can be fitted with an optional hand crank.
The time to order is now
On March 10, 2011 we had a good stock of HEPA filters. On March 11th, the Fukushima nuclear disaster happened in Japan. By the end of the day on March 12th, we were sold out.
We purchase our HEPA filters from the largest air filter manufacturer in the United States. But they are usually four weeks out, three weeks if we push them. We had to put dozens of people on back order that March. They had to wait a month to get their NBC air filtration system.
This is in spite of the fact that we cannot export the Safe Cell. Due to the high level of filtration, the US State Department has determined that it is controlled for export under class 14 of the US Munitions list. We did not ship any Safe Cells to Japan.
When there is a nuclear event anywhere in the world, it will be too late to order an NBC filtration system.
Design specifications and filter certification
The Safe Cell NBC air filter has been engineered to meet the critical specifications outlined in the US Army Corps of Engineers Design of Collective Protection Shelters to Resist Chemical, Biological, and Radiological (CBR) Agents, Technical Letter Number ETL 1110-3-498.
We have a comprehensive page dedicated to documenting the testing and certifications of the Safe Cell. See it here: Safe Cell Testing and Certifications
Integrated Battery Backup
This is what sets the Safe Cell apart from all other NBC air filters. The 60 and 120 CFM AC and DC Safe Cells normally operate on standard 120 volt AC power but also have an integrated battery backup capability. They feature an internal automatic switching power supply that switches to a user supplied 12 volt deep cycle battery if the grid goes down.
The internal power supply is housed in a grounded steel Faraday cage. If a spike in current comes down the AC power cord, the AC fuse will blow and the relay will connect the blower directly to the battery – maintaining overpressure in your shelter. No other NBC air filter has this capability built into it.
Manual Hand Crank Backup
Any electrical system can fail and batteries under long term storage in a shelter are no exception. As a last resort, our backup hand crank will keep you safe in your shelter. It mounts at a comfortable height and is easy to operate. No NBC filter should be without a manual backup system.
Due to it’s light weight ABS construction, the 60 CFM Safe Cell weighs just 49 pounds and the 120 CFM Safe Cell weighs 60 pounds. Each of these models has generous wrap around flanges at a good lifting height that provide a secure handle for one or two people to lift and carry it.
The safest way to change the filters in a shelter is to suit up, seal up the filtration system by put the shipping caps on the intake and outflow ports, remove it from the wall mount, and take it outside to change the filters – leaving the contaminated ones outside of your protected space. See page 13 of the Safe Cell manual for the complete instructions on changing the filters.
The Safe Cell is attached to the wall mount brackets by star nuts that do not require any tools to remove. Once you are safely outside or in the airlock of your shelter, removing the top six 9/16″ flange nuts on the side plates and mounting clamps allows the top end bell to come off. The filter elements are stacked up just under the top end bell, from top to bottom: the carbon adsorber, the HEPA filter, and in the bottom end bell are the two pre-filters. No other NBC filter has this safe of a filter changing protocol.
In Stock in the United States
In addition to having the lowest price per CFM when compared to other filters, the Safe Cell’s supply chain starts in America, not in Europe. Manufactured at our factory in southern Oregon, we stock both the 60 CFM and the 120 CFM Safe Cells for fast delivery.
We operate our own production facility, which includes machine shop, a fabrication shop tooled up to manufacture our blast doors and hatches, an assembly shop where we bring everything together for final assembly, testing, quality control.
You don’t have to wait six weeks, pay customs or brokerage fees, and arrange your own shipping from the nearest international airport. Just call 541-459-1806 to place your order and your filters are shipped right to your door by UPS. The carton content labels are on the inside of the box flaps so it’s not obvious to the box handlers and delivery drivers that you purchased an NBC filter and the only records kept of your purchase are held securely by American Safe Room.
The Safe Cell NBC air filter has been in continuous production since 2002. It’s a mature product that has gone through several evolutionary design changes and numerous product improvement revisions.
Find out who invented it and how it was designed: The history of the Safe Cell.
Online Installation and Operation Manuals
We have all of our manuals online so you can see the installation steps, how to operate it, and the complete specifications. Simply go to the detailed product page and click on the manual thumbnail in the right column. Here is the 60 CFM Safe Cell manual and here is the 120 CFM Safe Cell manual.
Do not purchase an NBC air filtration system that doesn’t come with a manual!