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Biohazards to Bioterrism


MICROCON® 800 - Survivor Series
The purpose of the MICROCON® SS is to provide a rapid, simple and economical means of providing high volume highly filtered and irradiated safe breathable air to a secured contained space. The shelter will maintain a slight positive pressure by the air being admitted. It's portable and can be wheeled to a predetermined location or permanently mounted and installed. The two pre-requisites for installation are an air source and 115V power.

Outside air (or any air source) is drawn into the unit through a 10-12" duct that attaches to the duct collar mounted to the intake of the HEPA filter cube. After numerous stages of filtration any incoming air has been thoroughly cleansed, irradiated and rendered safe of any airborne pollutants or contaminants.

1st Stage - particulate pre-filtration:
Incoming air is first filtered through a 100% polyester fiber, 3-stage panel filter. The polyester filter will not absorb moisture or shed. The composition of the matrix is a dry open web that serves a first stage pre-filter for entrapment of larger size particles. The second stage is comprised of finer denier fibers to entrap smaller particles. The final layer is a tightly needled matrix treated with a non migrating tackifier for even smaller size particles. The progressive filtration feature of graduated densities allows for the finer size particulate to become entrapped deep within the filter thereby increasing filter life and efficiency. This first stage filter is to provide the larger size particles from reaching the HEPA filter thereby increasing its life and efficiency.

2nd Stage - high efficiency particulate filtration:
The high capacity HEPA filter is manufactured with a high alpha high capacity micro-glass media. Filters are 99.99% efficient and tested individually and certified to have a maximum efficiency of not less than 99.97% when challenged with .3 micron size particles of a thermally generated challenge agent. The HEPA filter is permanently sealed and encapsulated within a steel enclosure that guarantees a self-aligning leak free seal. HEPA filters are the only filtration device that has the capacity to contain nuclear particles. True bag-out filter replacement eliminates any exposure to the contaminated filter by maintenance personnel during filter renewal procedures.

3rd Stage - odor/fume adsorption:
Once the particulate matter is eliminated from the air stream by the progressive filtration stages, the gas air pollutants are then addressed by a series of activated carbon cells. These contain 60% activated premium grade coconut shell carbon granules for absorption of odors and gases from the air-stream. There is also the addition of impregnated carbons and potassium permanganate for removal of compounds such as ammonia, hydrogen sulfide and formaldehyde which carbon has little effect on.

4th Stage - germicidal irradiation:
The base of the fan module contains four 16", 254nm germicidal  ultraviolet (ultra violet) lamps. The 254nm wavelength had been recognized as an effective means of air disinfection. The UV works by breaking down and altering the DNA molecules which consequently destroys replication and kills the cell. Where HEPA filters have proven to be effective in containment of microbial contamination such as bacteria, mold spores, mildew, dust particles and pollen, UV works on smaller size organisms that would not be contained by the HEPA filter. These would include organisms in the various virus families. The lamps are purposely positioned downstream of the HEPA filters to protect the lamps surfaces. Since all particulate matter has been eliminated by the air stream there are no airborne particles to attach themselves to the lamp surface thereby reducing their irradiation levels. It also eliminates the need for periodic cleaning of the lamp surfaces which is a customary and required procedure when utilizing UV lamps. Lamps are designed for approximately 6000 hrs. of operation before they require renewal.

The unit is modular in design and each stage is an individual cell that
locks and seals to the proceeding module. The base is designed to exhaust air in a 360° direction. This disperses air in all directions and eliminates positioning concerns. In the event a single exhaust duct is required, we simply use block-out panels to block exhaust in all but one direction. This could be of any of the four sides.

A variable speed electronic fan control knob adjusts the cfm volume. An electronic hour meter monitors the overall operation time of the system. A pressure differential gauge is incorporated to constantly monitor the pressure differential in the system thereby identifying when filters require replacement.

The fan is permanently sealed and self lubricated and requires no maintenance or adjustment.

The base is of stainless steel construction with four, four inch rubber wheels (two locking). The exterior surfaces of the filters are powder coated baked on steel.

If permanent installation is required, a pedestal can be included to fasten to the floor, preventing mobility.


Adequate air flow in a shelter calculates to about 4 cubic feet per minute (cfm) per person (or 6.6 meters cubed per hour (m3/h)). In a humid environment these figures should be increased by a factor of 2. Based upon a conservative air delivery of 600 cfm, there is 36,000 cfm of filtered air being delivered each hour.

The integrity of the shelter itself is critical to survival success. An air tight shelter is paramount with a slight positive pressurization to the surrounding areas. An exhaust system is required to rid the shelter of pollutants and gases generated within the space.

Other system considerations:
The MICROCON® is the only component in a system that must include various other components and systems to accomplish a total secure environment. For example, a power source must be available to provide power and run the various appliances needed. This might include a gas powered generator and supply of fuel. Food type and storage must be addressed. Communication equipment to allow contact and information with the outside. Some means to condition (heat or cooling) the inside air. Heat and humidity will increase very rapidly inside a sealed shelter area. A means for the elimination of waste material. A system for storage and replenishment for the water supply, and light sources, both battery and generator types.

The design of the shelter should depend upon the anticipated longevity of occupation, the number of occupants, and to what degree of inclusion the systems must be incorporated. Several factors will ultimately determine the success rate of the shelter such as the severity of an incident, weather conditions, and proximity to ground zero. Being prepared will only improve the survival rate for those who plan ahead.


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