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Filters like canisters filled with activated carbon in granular
and powder form shows the problem of channeling, desegregation,
lower efficiency in dynamic system and high pressure drop. However,
the problem of the canisters is solved with cloths, foams and felts
that support powdered activated carbon. These products are extensively
used in air conditioning systems as molecular filter.
But, what about the following problems of these products?:
- Less adsorption of contaminants of powder activated carbon in
dynamic flows than activated carbon fibers.
- The binder between the activated carbon and the support fill
an important part of the pores, decreasing the adsorption capacity.
- Only a part of the weight of the filter is effective as molecular
filter, being the support weight only structural.
When ACF's are used, all these problems are solved:
- Higher adsorption rate of pollutants
- There are not binder
- All the weight is structural and molecular filter at the same
time
For these reasons, the number of companies using 100% activated
carbon fabrics is growing up.
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