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How the Allerair High Efficiency
Air Filtration system works
Air purifiers that use a 4 phase filtration system:
As the air passes through them, they are:
- Pre-filter,
- Mass Activated Carbon Bed (MAC-BT) filter,
- 2 anti-microbial filters
- HEPA filter.
1) Prodense, cotton or tar-trapping pre-filters
Traps larger dust particle and is easily removed and cleaned with
a vacuum cleaner. It acts to stop the larger particles such as dust
and lint from clogging the other filters.
2) The mass activated carbon bed (MAC-BT) filter
Adsorbs gases and odors. (Adsorb: no it's not a typo. This is the
process by which activated carbon captures gases and odors.)
Most off the shelf air cleaners have a few token ounces of carbon
sprayed on the pre-filter. This is only sufficient to capture a small
amount of the noxious gases and odors in the air and for only a short
period of time.
The MAC-B carbon filter has pounds of activated carbon (from 7 to
160 lbs.) that will trap 90% of gases and odors that pass over it
and will continue working for many months before needing to be replaced.
3) The 2 anti-microbial filters (non anti-microbials on MCS units)
Trap the airborne microorganisms that pass through them.
4) The HEPA filter
Traps the airborne particles. These filters were developed by the
Atomic Energy Commission to trap radio-active particles. They can
capture 99.97% of particles as small as 0.3 microns. That is as small
as some bacteria.
The power of activated carbon
Activated carbon is the only safe, cost effective way to trap noxious
gases and odors
What it does and how it works.
Activated carbon is carbon that has been treated with oxygen to open
up millions of tiny pores between the carbon atoms.
There are so many of these that one pound of activated carbon has
a surface area of 60 to 150 acres.
The technology used in military gas masks
Activated carbon is the substance that keeps military personnel safe
from poisonous gases. It is also used for water filtration.
Adsorption
Adsorbtion is the process where certain chemicals are attracted to
activated carbon and then bond to it. The millions of pores in the
activated carbon provide an enormous surface area to trap these chemicals.
The bigger the filter, the more chemicals it adsorbs and the
longer it keeps on working
 An
activated carbon filter acts rather like a sponge. When it is full
it can adsorb no more. The more carbon you have the more you can adsorb
before changing the filter. AllerAir MAC-B carbon filters have from
7 to 48 lbs and will last from 9 to 24 months. 
Most off the shelf cleaners have only a few token ounces of carbon
sprayed on a mesh.
It's not enough to have any useful long term effect. |
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