NBC Air Filtration


Collective protection for civil defense
A nuclear, biological, and chemical (NBC) safe room protects its occupants from inhaling harmful or deadly airborne toxins such as very fine particles of radioactive fallout, biological toxins, and chemical agents. In the past, the United States Government has poured extensive resources into providing the best information for the protection of its citizens from NBC warfare agents. This is not the case today.

For protection of the U.S. population we have the government website: www.ready.gov. It suggests duct tape and plastic, then wait for further official instruction. Although the tape and plastic method would offer some immediate short term protection from low level toxins at low concentrations, it would be, at best, a short term solution. Most governments tend to only recommend emergency procedures that can be afforded by all their citizens.

As a contrast to most governments, both Switzerland and Israel require, and subsidize the cost of, NBC safe rooms and blast shelters in residential dwellings and commercial buildings. They have strict standards in place governing both the construction of the room and the ventilation equipment protecting the room.

For protection of some of our military personal and government officials, the U.S. Department of the Army – Corps of Engineers has standards by which NBC airborn toxic free areas must comply. These standards dictate the differential pressure (overpressure) in the safe room (protected space) as well as the design of the NBC filter/ventilation system.

The main reasons why an un-pressurized room will not protect the occupants for very long is that the room “breaths” – in other words, it leaks air both in and out through the cracks as the external atmospheric pressure fluctuates – due wind or other atmospheric variables like temperature, and barometric pressure swings due to approaching weather fronts. Air constantly tries to normalize its pressure and temperature between different variants – as it does this, it brings with it whatever that air contains. Also, in a sealed room, there is no accommodation to replenish oxygen and expel the exhaled carbon dioxide of the occupants.

In order to create and maintain overpressure as well as give the required air exchanges to support the air supply needs of the sheltered occupants, a safe room must be equipped with true positive pressure NBC filter/ventilation unit and a means of a metering the exhaust air out of the protected space.

American Safe Room filter/ventilation equipment and related components are designed and manufactured specifically for this purpose.



A safe room consists of an envelope (a room) that has a true NBC filtration/ventilation system installed that will maintain more air pressure inside the room than outside of it (overpressure) in order to constantly keep air blowing outward from the protected space. This will not allow airborne toxins from migrating back into the room and your lungs.

With the right equipment, standard residential construction – homes and apartments – can be a perfectly suitable envelope to keep out airborne toxins. Absolute sealing of the room is not necessary – as long as you have achieved and maintain overpressure.

Even if you are inside a hermetically sealed container, you need true ventilation – air in and air out. This ventilation continually removes moisture, heat, and carbon dioxide that is exhaled by the occupants while bringing in a fresh supply of oxygen-rich air.

This air must be filtered in order to make it safe and breathable. The best filter combination is a bank of pre-filters, an individually DOP scan tested nuclear grade HEPA for radioactive fallout and a nuclear grade carbon adsorber that will adsorb radioactive iodine.

All of the component necessary to do any kind of installation of a safe room is right here, waiting for you.




http://www.americansaferoom.com/images/Safe-Cell-48-100N-AC-DC-everything-included-01.jpgThe Safe Cell is a portable, positive pressure emergency air filtration system designed to overpressure protected spaces such as bomb shelters, and safe rooms to provide collective protection during and after a nuclear, biological, or chemical event.

It features a filter bank that is designed to protect against all known airborne toxins including nuclear fallout, radioactive iodine, weaponized biological carcinogens, and warfare gases such as sarin, VX, and tabun.

The entire system has been designed to meet the critical requirements in the United States Army Corps of Engineers Technical Letter ETL 1110-3-498.

To order one of these systems, please contact American Safe Room.

Common capabilities and features

  • Designed for installation in protected spaces up to 3,500 cubic feet (99 cubic meters)
  • Designed for installation in protected spaces holding up to 12 occupants using the ASHRE standard of 5 CFM per occupant
  • Designed for wall mounting inside a protected space

One Response to “NBC Air Filtration”

  • Designing residential shelter no larger than 6′ x 10′ x 6′ tall. Must conserve on space and must know where to mount unit on wall before purchasing shelter, therefore this unit must be engineered for shelter. Must be battery / hand crank unit. Can you help. Email or call me at 318-547-4179.

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