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Download the FEMA publication,
Are Your Ready?

Both the US DEPARTMENT OF HOMELAND SECURITY (DHS) and Israel's HOME FRONT COMMAND tell you to find a shelter in case of a nuclear, biological or chemical attack. In Israel, every building has a safe room built to Israeli government standards. In the US, the DHS has recommended that US citizens create their own safe rooms using polyethylene sheeting and duct tape. The idea is to seal off a room in your home and/or office from the environment for up to 48 hours. FEMA also has a publication with guidelines on what emergency supplies to include in the shelter.

Would you put a bag over your head if someone told you to? Using duct tape and plastic sheeting to seal yourself into a safe room is a good plan except for the fact that you will eventually suffocate. The OnSiteAir™ Emergency Air-Safety Kit provides you with the means to maintain Carbon Dioxide (CO2) and Oxygen (O2) at safe levels in a sealed room for a specified time period. So go ahead and seal yourself in, just make sure to use OnSiteAir™.

The OnSiteAir™ Emergency Air-Safety Kit contains everything you need to deal with rising CO2 levels and diminishing O2 levels in a sealed room environment. No batteries or electrical power required, just enter your room, seal the room, and follow the OnSiteAir™ instructions.

You will need to follow the directions carefully, of course, to make sure you have enough kits for your planned emergency. And make sure that you secure your area tightly to avoid contamination from external toxins, or oxygen leaks from your "safe" area. No place is guaranteed to keep you totally "safe" in the event of an attack.

Based on NASA research, carbon dioxide levels of 3% or more are unsafe. In addition, Oxygen levels below 15% are unsafe. The OnSiteAir™ Kit is designed to keep you in the safe zone.

What Happens in a Sealed Room Environment?
As you breathe, your body consumes oxygen and gives off carbon dioxide, causing the carbon dioxide levels in a room to rise and oxygen levels to fall. As seen in the charts (below), carbon dioxide levels will continue to rise above 3% and oxygen levels will continue to fall below 15% unless something is done. The purpose of the OnSiteAir™ kit is to keep the air in the sealed room in the safe zone.

How The OnSiteAir™ Emergency Air-Safety Kit Works
The OnSiteAir™ kit contains ExtendAir™ CO2 absorbent and an oxygen source, OnSiteO2™. Simply hang up the ExtendAir™ CO2 absorbent curtain to maintain a safe CO2 level and use the oxygen source to replace the oxygen that has been consumed. Failure to follow the use instructions carefully can lead to suffocation or death.


(2) ExtendAir CO2 absorbent curtains
(1) deployment hanger
(1) Oxygen delivery system
Use Instructions (pdf)
Tape measure

(2) ExtendAir CO2 absorbent curtains
(1) deployment hanger
(2) Oxygen cylinders
Use Instructions

In order to use these kits, you need to know the length of stay, room size, and number of people in the sealed room. The worksheet below will tell you how many kits are required to support your specific needs.

OnSiteAir™ Worksheet
Click here to pop-up a printable OnSiteAir™ Worksheet


Let's say you have a family of 4 and want to prepare a sealed room in your house that will support you for 14 hours. Your room is 12 ft. by 10 ft. with an 8 ft. ceiling. Using the worksheet shows that you need one (1) OnSiteAir™ Kit and one (1) refill kit.

If you entered your sealed room at midnight, the first OnSiteAir™ kit gets used at 8:29 AM.

The refill kit would be used at 11:29AM and last until 2:29 PM. Failure to follow the use instructions carefully can lead to suffocation or death.

Creating Your Safe Room
Some general advise is to pick a room on an upper floor with as few windows and external walls as possible. A room with an adjoining bathroom like a master bedroom or executive office is ideal since it probably already has the creature comforts and a phone. Basement rooms should be avoided since some poison gasses tend to collect in low places. You should allow for a minimum of one-square yard of floor space per person (72 cubic feet) or more if available.

Deciding to stay or go. (
Download the FEMA publication, Are Your Ready?

About ExtendAir™
ExtendAir™ CO2 absorbents are manufactured by Micropore Inc. with manufacturing facility in Newark, Delaware. ExtendAir™ brand producs are used for life support applications in SCUBA, homeland safety, military, medical and fire-fighting markets. This technology is used in submarines and spacecraft and has been used for over 100 years. It is proven and very effective. ExtendAir™ absorbent has the additional benefit of working without any fans or other powered devices, which is not the case with other absorbent systems. To learn more about other ExtendAir™ products, please visit our website

Department of Homeland Security
National Institiute for Chemical Studies "Shelter-in-Place" Information Center
Testimonials from effective shelter-in-place survivors (PDF download)
Chemical Stockpile Emergency Preparedness Program shelter-in-place
Citizen Corps  | © 2003 ExtendAir