NBC Air Filtration Systems
Safe Cell NBC Air Filter
An NBC air filter draws air from outside a safe room or bomb shelter, runs it through a series of particulate and gas 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.
American Safe Room manufactures the Safe Cell NBC Air Filtration system. Several thousand Safe Cells are in use now in underground bunkers, safe rooms, nuclear power plants, chemical plants, harbor patrol boats, and WMD detection stations. It is a proven NBC air filtration system that has redundant backup capabilities that will give you highly effective CBRN collective protection in your safe room or bomb shelter.
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.
The HEPA filters we use in the Safe Cell is constructed from nuclear grade media and is individually scan tested and certified by the largest filter manufacturer in America. Each HEPA filter is serial numbered and placarded with with its individual performance specifications. These are the only kind of HEPA filters allowed in nuclear power generation plants by the Department of Energy (DOE-STD-3020-2005).
The carbon adsorber uses a blend of NUK-TK carbon that is optimized for radioactive iodine and ASZM-TEDA for the higher volatility warfare gas agents. This gives you protection from the widest spectrum of airborne gas threats. The granular carbon blend is compressed into a tight block to eliminate blow-by and has the proper bed depth to meet the Corps of Engineer’s air residency specification for adsorption of chemical agents. This is critical because the carbon does not “filter” the air – it adsorbs gases molecule by molecule onto it’s surface. Without the proper residency time, lethal gases can be introduced into the protected space.
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!