|The Airpura High Efficiency
The pre-filter traps larger
dust and particles. It may be vacuumed from the exterior of the unit. It acts to
stop the larger particles such as dust and lint from clogging the other
The activated carbon bed adsorbs
airborne chemicals, gases and odors. Many air purifiers offer only a spray of
carbon sprayed on the pre-filter. This is only sufficient to capture a small
amount of gases and odors and soon fills up.
Airpura carbon filters have from 18 to 30 pounds of
activated carbon that will trap 60% of its own weight in airborne chemicals,
gases and odors. They will keep on adsorbing harmful chemicals for 24 months in
The 2 Micro-supress filters on each
side of the carbon bed kill microbes that may collect on them.
The true HEPA filter traps 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.
Adsorbtion with Activated
Activated Carbon is the only safe, cost effective way to
trap noxious gases and odors
Activated carbon has been treated with oxygen to open up
millions of tiny pores between the carbon atoms.
There are so many of
these spores that one pound of activated carbon has a surface area of 60 to 150
Activated carbon is the substance that keeps military personnel
safe from poisonous gases. It is also used for water
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.