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Air Filtration

American Safe Room Safe Cell 60

The Safe Cell 60 CFM

 Nuclear, Biological, and Chemical air filtration system

Class 1 Collective Protection Area

  • Manufactured in the United States continuously since 2002 with thousands of installations
  • Used in refuge chambers of nuclear power plants, chemical factories, and chosen for dozens of Homeland Security funded harbor patrol vessels
  • Designed in accordance with the US Army Corps of Engineers technical letter on collective protection.

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, or 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 – the first is a built in battery backup capability; either manual or automatic. The second is the optional hand pump or hand crank. When the grid goes down, you can stay buttoned up!

 

When properly installed, the Safe Cell will create a Class I protected area. This is filtration with pressurization that is applicable against wartime military threats that produce a large-scale release of agents over an extended period of time. Effective protection requires a CBR filtration and overpressure system that resists a continual large-scale threat in a 40-km/hr (25-mph) wind. 

Because it is designed to be placed inside the protected space, the Safe Cell’s internal blower draws air through a bank of four filters in this order:

  1. A roughing filter
  2. A pre-filter
  3. A nuclear grade HEPA filter
  4. An activated carbon gas adsorbsion filter

The Pre-Filters

The relevant sections from ETL 1110-3-498:

Roughing Filter
Continuously operated filter systems will have a roughing filter with an average efficiency of 25 to 30 percent when tested in accordance with   ASHRAE 52.1. The roughing filter extends the life of the intermediate filter or pre-filter and reduces its change frequency.

Pre-filter
The pre-filter or intermediate filter will have an average efficiency of 80 to 85 percent when tested in accordance with ASHRAE 52.1. The pre-filter extends the life of the HEPA filter and reduces its change frequency.

Our supplier confirmed that our pre-filter media meets the requirements in ASHRAE 52.1 in this this letter:

“Roughing Filter–this is our new Perfect Pleat filter. It meets ASHRAE 52.1 @ 25-30% efficiency … Pre-filter–two choices here. I would recommend the Poly Blue pad … meets the arrestance value of 80-85%.”

The High Efficiency Particulate Air Filter

The relevant section from ETL 1110-3-498:

HEPA Filter. The HEPA filter frame and filter media will meet the construction, material, testing, qualification, and documentation requirements of ASME N509, ASME N510, and UL 586 and will have a filter efficiency of 99.97 percent at a 0.3 Fm diameter particle size when tested in accordance with the MIL-STD-282 dioctyl phthalate (DOP) test method. The filter frames will meet the requirements of ASME AG-1a, Section FC. The HEPA filter medium will meet the requirements of MS MIL-F-51079D.

The nuclear grade HEPA filters we use in the Safe Cell are individually tested and are placarded with a serial number and the tested efficiency. They all rate at least 99.97% efficient or they are discarded. See this Certificate of Conformance from the manufacturer. They are certified to contain nuclear grade media.

MIL-STD-282 is a testing standard for HEPA filters that uses dioctyl phthalate (DOP). DOP has since been found to be a potential carcinogen and is no longer used to test HEPA filters.  Emery 304 PAO is now used industry wide as a DOP replacement.

MIL-F-51079 has been cancelled and replaced by ASME AG-1. We have certification (2 pages) from the Department of the Army, Edgewood Research Development and Engineering Center that that our filters use media that conforms to ASME AG-1.

The carbon absorber – carbon selection

This is where the Safe Cell deviates from the specification. We use a carbon that is optimized for radioactive iodine.

Radioactive iodine is a gas (not a particulate) that is generated by nuclear events like atomic bomb detonations and nuclear power accidents. We’ve sold thousands of Safe Cells and the overwhelming concern our customers have is for nuclear events. We worked with our carbon supplier to find a carbon that is optimized for radioactive iodine.

This is a carbon called NUK-TK Nuclear Grade Carbon. It is impregnated with both TEDA (triethylenediamine) and potassium iodide. In 1982, the U.S. Food and Drug Administration approved potassium iodide taken orally to protect thyroid glands from radioactive iodine. These are the “radiation pills” sold on prepper websites on up to Amazon. American Safe Room is the only NBC filter manufacturer that uses the carbon that has been impregnated with potassium iodide.

NUK-TK starts with a base carbon of virgin coconut shell carbon with over 60 CTC value. Then, it’s impregnated with potassium iodide (KI) along with the TEDA impregnates. When activated carbon is impregnated for any function, the base carbon continues to be effective for target gases that do not require impregnations to adsorb. The impregnation of carbon simply compounds the numbers and types of gases the carbon can now capture. The co-impregnates of KI and TEDA have other reactive benefits for various gases. The KI portion of the impregnation is excellent for sulpherous compound removal.

Safe-Cell-120-CFM-NBC-filter Underground Bunker

The Safe Cell 120 CFM

Nuclear Biological, and Chemical air filtration system

Class 1 Collective Protection Area

  • Manufactured in the United States continuously since 2002 with thousands of installations
  • Used in refuge chambers of nuclear power plants, chemical factories, and chosen for dozens of Homeland Security funded harbor patrol vessels
  • Designed in accordance with the US Army Corps of Engineers technical letter on collective protection.

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, or 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 – the first is a built in battery backup capability; either manual or automatic. The second is the optional hand pump or hand crank. When the grid goes down, you can stay buttoned up!

 

When properly installed, the Safe Cell will create a Class I protected area. This is filtration with pressurization that is applicable against wartime military threats that produce a large-scale release of agents over an extended period of time. Effective protection requires a CBR filtration and overpressure system that resists a continual large-scale threat in a 40-km/hr (25-mph) wind. 

Because it is designed to be placed inside the protected space, the Safe Cell’s internal blower draws air through a bank of four filters in this order:

  1. A roughing filter
  2. A pre-filter
  3. A nuclear grade HEPA filter
  4. An activated carbon gas adsorbsion filter

The Pre-Filters

The relevant sections from ETL 1110-3-498:

Roughing Filter
Continuously operated filter systems will have a roughing filter with an average efficiency of 25 to 30 percent when tested in accordance with   ASHRAE 52.1. The roughing filter extends the life of the intermediate filter or pre-filter and reduces its change frequency.

Pre-filter
The pre-filter or intermediate filter will have an average efficiency of 80 to 85 percent when tested in accordance with ASHRAE 52.1. The pre-filter extends the life of the HEPA filter and reduces its change frequency.

Our supplier confirmed that our pre-filter media meets the requirements in ASHRAE 52.1 in this this letter:

“Roughing Filter–this is our new Perfect Pleat filter. It meets ASHRAE 52.1 @ 25-30% efficiency … Pre-filter–two choices here. I would recommend the Poly Blue pad … meets the arrestance value of 80-85%.”

The High Efficiency Particulate Air Filter

The relevant section from ETL 1110-3-498:

HEPA Filter. The HEPA filter frame and filter media will meet the construction, material, testing, qualification, and documentation requirements of ASME N509, ASME N510, and UL 586 and will have a filter efficiency of 99.97 percent at a 0.3 Fm diameter particle size when tested in accordance with the MIL-STD-282 dioctyl phthalate (DOP) test method. The filter frames will meet the requirements of ASME AG-1a, Section FC. The HEPA filter medium will meet the requirements of MS MIL-F-51079D.

The nuclear grade HEPA filters we use in the Safe Cell are individually tested and are placarded with a serial number and the tested efficiency. They all rate at least 99.97% efficient or they are discarded. See this Certificate of Conformance from the manufacturer. They are certified to contain nuclear grade media.

MIL-STD-282 is a testing standard for HEPA filters that uses dioctyl phthalate (DOP). DOP has since been found to be a potential carcinogen and is no longer used to test HEPA filters.  Emery 304 PAO is now used industry wide as a DOP replacement.

MIL-F-51079 has been cancelled and replaced by ASME AG-1. We have certification (2 pages) from the Department of the Army, Edgewood Research Development and Engineering Center that that our filters use media that conforms to ASME AG-1.

The carbon absorber – carbon selection

This is where the Safe Cell deviates from the specification. We use a carbon that is optimized for radioactive iodine.

Radioactive iodine is a gas (not a particulate) that is generated by nuclear events like atomic bomb detonations and nuclear power accidents. We’ve sold thousands of Safe Cells and the overwhelming concern our customers have is for nuclear events. We worked with our carbon supplier to find a carbon that is optimized for radioactive iodine.

This is a carbon called NUK-TK Nuclear Grade Carbon. It is impregnated with both TEDA (triethylenediamine) and potassium iodide. In 1982, the U.S. Food and Drug Administration approved potassium iodide taken orally to protect thyroid glands from radioactive iodine. These are the “radiation pills” sold on prepper websites on up to Amazon. American Safe Room is the only NBC filter manufacturer that uses the carbon that has been impregnated with potassium iodide.

NUK-TK starts with a base carbon of virgin coconut shell carbon with over 60 CTC value. Then, it’s impregnated with potassium iodide (KI) along with the TEDA impregnates. When activated carbon is impregnated for any function, the base carbon continues to be effective for target gases that do not require impregnations to adsorb. The impregnation of carbon simply compounds the numbers and types of gases the carbon can now capture. The co-impregnates of KI and TEDA have other reactive benefits for various gases. The KI portion of the impregnation is excellent for sulpherous compound removal.

 

Andair VA_40 Underground Bunker

ANDAIR VA-40

The VA 40 can be manually operated in case of power failure. This filtration units is designed to filter out impurities in the air such as chemical warfare and radioactive particles etc. This Product was designed and manufactured according to the directives of the Swiss Federal Office of Civil Defense. Type tested and approved by the Armament Technology and Procurement Group.

Product Consists of:

47 CFM Fresh Air and 24 CFM Filtered Air

  • Filter casing
  • High efficiency filter
  • Activated carbon filter
  • Air inlet with closures
  • Air outlet with closures
  • Pressure compensation screw
  • Floor fastening bracket
  • Steel dowels
  • Plastic cover

Function:

The polluted air first passes through the high efficiency filter, which retains the finest impurities (solid and liquid as well as radioactive particles). Then the air flows through the activated carbon filter, which can absorb gases by physical and chemical action. The filter absorbs chemical and bacteriological bodies from the fresh air.

General:

The air in- and outlets are hermetically closed and sealed. The filter must never be opened. Test carried out with the gas filters over 20 years old have proven that filters remain operative over a long period of time provided they are kept sealed.

 

 

Andair VA_40 Underground Bunker

ANDAIR VA-75

The VA 75 can be manually operated in case of power failure. This filtration unit is designed to filter out impurities in the air such as chemical warfare and radioactive particles etc. This Product was designed and manufactured according to the directives of the Swiss Federal Office of Civil Defense. Type tested and approved by the Armament Technology and Procurement Group.

Product Consists of:

88 CFM Fresh Air and 44 CFM Filtered Air 

  • Filter casing
  • High efficiency filter
  • Activated carbon filter
  • Air inlet with closures
  • Air outlet with closures
  • Pressure compensation screw
  • Floor fastening bracket
  • Steel dowels
  • Plastic cover

Function:

The polluted air first passes through the high efficiency filter, which retains the finest impurities (solid and liquid as well as radioactive particles). Then the air flows through the activated carbon filter, which can absorb gases by physical and chemical action. The filter absorbs chemical and bacteriological bodies from the fresh air.

General:

The air in- and outlets are hermetically closed and sealed. The filter must never be opened. Test carried out with the gas filters over 20 years old have proven that filters remain operative over a long period of time provided they are kept sealed.

 

Andair VA_40 Underground Bunker

ANDAIR VA-150

The VA 150 is designed to be manually operated in case of power failure. This NBC filtration unit is designed to filter out impurities in the air such as chemical warfare and radioactive particles etc. This Product was designed and manufactured according to the directives of the Swiss Federal Office of Civil Defense. Type tested and approved by the Armament Technology and Procurement Group.

176 CFM Fresh Air and 88CFM Filtered Air

  • Filter casing
  • High efficiency filter
  • Activated carbon filter
  • Air inlet with closures
  • Air outlet with closures
  • Pressure compensation screw
  • Floor fastening bracket
  • Steel dowels
  • Plastic cover

Function:

The polluted air first passes through the high efficiency filter, which retains the finest impurities (solid and liquid as well as radioactive particles). Then the air flows through the activated carbon filter, which can absorb gases by physical and chemical action. The filter absorbs chemical and bacteriological bodies from the fresh air.

General:

The air in- and outlets are hermetically closed and sealed. Also the filter must never be opened. Test carried out with the gas filters over 20 years old have proven that filters remain operative over a long period of time provided they are kept sealed.

 

LUNOR Blast Valve

LUNOR UEV/ESV1 Blast Valve

Lunor Blast Valves (UeV/ESV) are used in air outlet openings of civil defense shelters, military facilities and industrial buildings to block out the destructive effects of all types of explosions.

1 BAR Protection

Product Information:
This product is tested and approved by the Armament Technology and Procurement Group of Switzerland and is designed according to the directives of the Swiss Federal Office of Civil Defense.
Valve casing and wall frame are made from hot galvanized steel. The shutting device is made of stainless steel. This valve is also effective as an overpressure valve.

 

ASR Blast-valve-manually-shut

ASR Automatic Blast Valve

 

American Safe Room manufactures these 7 BAR double acting automatic blast valves are engineer tested and certified to hold over 100 PSI and feature unique dual hemispherical valves that have the fastest closing time of any poppet valve available. 

Speed

The faster your blast valves close, the less blast pressure and airborne toxins are introduced into your shelter. They feature dual stainless steel hemispherical valves that are much lighter than the flat steel plates used in other blast valves. This arched shape uses less steel to hold the blast pressure. These valves are connected by a stainless steel guide rod that rides in a machined bronze bushing. This corrosion resistant construction prevents rust from slowing the reaction time.

Strength

This is the professional engineer’s stamped certification of a static pressure test of these valves. The valves held the pressure for two hours. In an actual blast, the impulse of the pressure wave is much shorter than one second. Static pressure tests will return a lower pressure rating than a dynamic test because you take the variable of time out of the test. If a blast valve will hold 101 PSI for two hours, it will hold much more in a duration measured in milliseconds. 101 PSI is seven times the atmospheric pressure at sea level.

Security

Our blast valves also feature a manual lock shut capability in case you have malicious people outside your shelter attempting to dump water, fuel, or smoke down your ventilation pipes. Another reason to shut down your vent pipes is if there is a structural fire right outside your shelter and you cannot get out.

Just drop the tethered lock bar onto the shaft and tighten down the knurled washer. Your vent pipes are now secured.

Positive and Negative Pressure

As a high pressure wave from a nearby detonation passes over the shelter, the pressure travels down the pipes and into the shelter. If it is not stopped, it will destroy the air filtration equipment and injure the occupants. Directly behind this high pressure wave is negative pressure (less than atmospheric). The atmosphere is blown outward from the center of the detonation leaving a partial vacuum. This phase of the detonation can be as dangerous as the pressure wave. If you’ve seen footage of a nuclear bomb test, you’ve seen the trees blown one way, then the other. The first direction is away from the blast as the blast pressure hits the trees, the second is the partial vacuum phase where the atmosphere is sucked back toward the center of the detonation. 

Automatic Operation

These blast valves automatically close for both positive pressure phase and negative pressure phase of a nearby detonation. When the outside air pressure returns to normal, the blast valve automatically returns to its normally open state. This allows to air flow into your Safe Cell and out of your exhaust port for normal operation, but will not allow a blast of high-pressure air to enter your shelter – and bring contaminants with it.

The ASR-101-BV explosion resistant blast valves are tested
to meet or exceed the following specifications:
-Type Automatic double acting blast valve
-Minimum closing pressure 0.5 PSI/3.5 kilopascals
-Maximum operating pressure 102 PSI/703 kilopascals
-Minimum operating temperature –15 degrees Fahrenheit/–26 degrees Celsius
-Maximum operating temperature 212 degrees Fahrenheit/100 degrees Celsius
-Weight 25.0 pounds/11.3 kilograms
-Static airflow resistance 0.15 inch of water column at 100 CFM
  (pressure drop) 0.25 inch of water column at 122 CFM
  0.50 inch of water column at 148 CFM
  0.75 inch of water column at 187 CFM
  1.00 inch of water column at 218 CFM
-Construction, body A-36/1018 steel
-Construction, valve heads 304 stainless steel
-Construction, seals Buna synthetic rubber
-Construction, guide bushing 60-60 Bronze
-Mounting 8 each 5/8”/16mm holes on 10.2”/260mm bolt circle

overpressure-valve-ceiling-944x1024-400x433

ASR Over Pressure Valve

Description
The ASR-50-OP Overpressure Valve is constructed from high grade stainless steel, a chemical
resistant latex rubber membrane and high impact acrylonitrile butadiene styrene. It has a weight
48½ ounces (1.4 kilograms) - without the blast valve attached.

Configurations
The ASR-50-OP Overpressure Relief Valve kit may be configured for installation on ether a wall or
ceiling exhaust port, with or without a blast valve.

Overpressure
The Safe Cell air filtration system works by drawing outside air through its filter banks and
introducing it into the shelter area creating a slight overpressure. This overpressure prevents
unfiltered air or toxins from migrating into the shelter area through any openings or cracks.

Adjusting the room overpressure and airflow
The overpressure relief valve is the variable factor which governs airflow and overpressure in an
airtight shelter room and has been preset at the factory for optimum performance.
Should you wish to change the pressure setting we urge you to first consult with technical
support at the factory at telephone 541-459-1806.
An airflow of 5-CFM (cubic feet per minute) per person at 0.3-inch w/g (water gauge) is
recommended. This meets the class-1 filtration requirement for Collective Protection as stated
by the Department of the Army, Corps of Engineers in their technical letter, number
ETL 1110-3-498.

Valve Functions
Your ASR-OP overpressure valve serves two functions:
1. It creates and maintains an overpressure in the shelter by adding the proper resistance to the
exhaust air outflow. The valve is normally closed and opens when the air pressure inside the
shelter has reached the release pressure of 0.04-inches of water column.
2. It automatically closes when a positive pressure wave from an explosion exceeds the internal
pressure of the shelter - up to 2.5 psi. When the outside air pressure returns to normal the
overpressure valve automatically returns to its normal operational state. For more
protection, the blast valve must be installed before the overpressure relief valve as in the
ASR-OP-BVWM and ASR-OP-BVCM configurations.

An airtight shelter must have an exhaust vent with an overpressure valve installed on an
opposite wall of the filtration unit output to insure that the sufficient per occupant ventilation
rate is taking place as well as proper overpressure.

 

Safe-Cell-hand-crank

ASR Emergency Backup Hand Crank

Emergency Backup Hand Crank

The ASR-100-HC Emergency Hand Crank will introduce safe, breathable air into your protected space when the power grid goes down and the capacity of the battery backup has been exhausted. After that, it will take mechanical force to pull safe, breathable air through the filter bank and into your protected space. This device will provide you with the means to do this.

This hand operated air pump mounts on the wall above the Safe Cell at a convenient height and is operated by rotating the handle. It is used to draw filtered air into a protected space during a long term power outage. The handle turns smoothly and is easy to operate.

Turning the hand crank at 60 revolutions per minute (RPM) will give an output of 250 cubic feet per minute (CFM). When attached to a Safe Cell, the bank of filters imparts a resistance to the airflow that reduces it to a complete system output of 60 CFM.

Our ASR-100-HC hand cranked blower may be mounted in any position and features aluminum, bronze, and Delrin® gears, riding in Delrin® sleeve bearings, and blower housings made from laser cut aluminum with a matched high velocity forward curved impeller made from Dielectrite 44-10 HG

ASR differential-pressure-gauge-

ASR Differential Pressure Guage

The differential pressure gauge is designed to be wall mounted.

The differential pressure gauge displays the difference in air pressure between the inside and outside of a shelter. It uses a sampling tube that goes through the wall or ceiling in order to read the outside air pressure. Another sampling tube is inside the housing and the difference in air pressure is displayed by a needle on a dial gauge. When you do not have the Safe Cell NBC overpressure air filter on, a properly installed differential pressure gauge will read zero because there is no difference in the air pressure inside, and outside of the shelter. When you start the Safe Cell, the gauge will read a higher pressure.

The unit of measure displayed is inches of water column (WC). There are 27.67 inches of water in one pound per square inch (PSI).

Air flow and air pressure are two properties of forced air that are linked together. As a general rule, the more air pressure, the less air flow. An airflow of 5 cubic feet per minute per person at 0.3-inch (7.62-mm) of water column is recommended by the United States Army Corps of Engineers in the technical letter ETL 1110-3-498.

There are three ranges of gauges available that display positive pressure:

  • Zero to 0.5-inches of water column
  • Zero to 1.0inch of water column 
  • Zero to 25 mm of water column
ASR automatic-ventilation-blower-400w

ASR Automatic Ventilation Blower

This automatic ventilation blower is a separate blower that mounts next to the Safe Cell and is used to provide ventilation when the shelter is unoccupied or there is no airborne threat outside. It uses all of the same plumbing as the Safe Cell NBC air filter – the air intake hose from the filter is slipped onto this blower and the air exits the protected space through the overpressure valve.

This separate fresh air blower is unique to the Safe Cell. Other NBC filtration systems have a “fresh air” mode where you bypass the filter elements and use the system blower to bring in unfiltered air. The last thing you want to do is put hours on the blower in your NBC filter just to ventilate your shelter. Save those hours for when you really need them.

Airflow and air exchanges

The fan is rated at 50 cubic feet per minute. This will give you three air exchanges per half hour in a 1,000 cubic foot shelter. If you live in a humid area or have a larger shelter, the timer can be increased in half-hour increments to provide more air exchanges.

strata-chamber-interior

Strata WorldWide Air Scrubber

Strata Active Air scrubbers have built-in fan systems
that draw air through the scrubber,
passing it through SodaSorb™ (soda lime)
cartridges

  • SodaSorb is packaged in cartridges to prevent spillage, eliminate the risk of air-borne dust and prevent “channeling” of the chemicals.They are easy to store and handle.
  • Low pressure oxygen cylinders fitted with individual flow-rate valves replenish oxygen levels
  • The flow-rate valves are set according to the number of occupants and control the release of oxygen into the environment
  • Scrubbers are powered by Gride power or battery-back up
  • They are standard in Strata refuge chambers and ideal for use in underground safe rooms
  • Powder coated sheet metal scrubber body
  • Soda lime cartridge rack
  • Fans:
    · 2 x 24 volt fans
    · RoHS Compliant
    · 24 volt input
    · 5.0 watt power rating
  • Flow Meters:
    · Up to 5.5 LPM distribution per oxygen cylinder
    • Single unit suitable for 0-30 persons
    • Multiple units required for more than 30 persons
    • Maintains CO2 concentration below 10,000ppm (1%)
    (MSHA standard)
  • Battery back-up life: 12 - 96 hrs (+ safety margin) and is scalable to customer requirements (depending on battery power)