Electrostatic Air Cleaners
An electrostatic precipitating (ESP
or Plasmas) air cleaner is usually
composed of two sections,
a charging section and a collection section.
The charging section uses high-voltage wires
to impart a positive charge to the incoming pollutant particles.
The charged particles are then drawn into a secondary electric field,
where they are collected on a series of metal plates
carrying the opposite charge. Clean air is then
re-circulated back into the general air stream.
It can capture particles in a range of 0.01 micron
to 1 micron. Some advanced types add
in a fan to enhance the draw-in efficiency.
Quite effective, removing about 95 percent of
bulk dirt and 85% percent of microscopic particles
(small to 0.01 microns),
and especially effective for gaseous
most of them consume the electricity
under 20 watts.No costly filters to replace:
the collection plates can be washed or wiped down.
The main disadvantage of this type of
unit is its high cost due to the sophisticated
One side effect should be concerned is that it
may produce ozone as a byproduct of use,
but it is none harm if the ozone emission is
well controlled under safety level.
HEPA Air Filtration
HEPA, which stands for High Efficiency
Particulate Accumulation, is a highly
effective filter originally designed for removing
radioactive particles from air. HEPA air filters
are made from very tiny glass fibers that are made
into a tightly woven paper. This creates a filter
consisting of a multitude of very small sieves
that can capture extremely small particles, including
some biological agents. Once trapped, contaminates
and particles are not able to flow back into circulation,
due to the highly absorbent pores of the HEPA air filter.
Effective at removing airborne solid and liquid particulate
(small to 0.03 microns) with up to 97.7% efficiency.
High replacement cost is a real disadvantage
to HEPA filters cannot be washed due to being too
easily damaged, they must be replaced periodically
depending on use, and typically cost very expensive.
Because of so dense, they require a strong
blower to move air through, racking up higher
energy costs.And they only remove odors
trapped in the filter as it passes through the unit.
Most Negative ionizers use tiny,
charged wires or needles to create ions
(gas molecules with a negative charge) that latch
onto airborne particles. The negative ions cause
microscopic particles (particulates) floating in a room,
that cause some people to have allergic reactions,
to clump together and fall to the floor (or other surfaces)
where they can be vacuumed up. This is due to an
electrostatic charge between the negative ions and
other air molecules and particles in the air.
Removes finer particles than HEPA filters or
any other type of air purifier available. A fan-type
air filter can only filter the air drawn through it,
whereas negative ions disperse throughout the
room causing particles to drop out of the air.
Well known as it a min A in the air purifier,
they also have been shown to help lift mood,
alleviate depression and seasonal affective disorder.
Many ionizers build up a coating of dirt inside
that makes them stop working after a relatively
short period of time.
An effective solution for this problem is to add in
fan before the ionizer wires or needles to
blow off the dirt while disperse the negative ions
more evenly throughout the room.
Ozonizer produces ozone by making oxidation.
When a molecule of oxygen, O2, is bound via
oxidation to a third oxygen atom, it becomes Ozone,
or O3, which is an unstable bluish water-soluble
gas with a very characteristic scent that is easy to recognize.
With very unstable characteristic, ozone has a strong
oxidation, so is widely used in our daily life for deodorization,
detoxification, sterilization, maintaining freshness, and bleaching.
Studies shown that ozone
is safe and effective if used properly for:
Used in indoor air purification, ozone is safe when
occurring within FDA standards at a concentration
of 0.05 ppm (parts per million). However, with such a
low concentration in the air, it doesn’t show apparently
effective in killing bacteria even deodorizing. So it isn’t
recommended that air purifiers use ozone for indoor
air purification.But there is a different story when
ozonizers generate ozone at certain level to effectively
eliminate odors or kill bacteria inside a closed space
without human beings or living animals in, such as
refrigerators, food storage containers, wardrobes and so on.
UV Air Cleaners
UV light air purification products are basically
specialized light bulbs that produce UVC light.
UV light is a well-known and effective killer of
biological organisms, and breaks down many
organic gases into their harmless components.
Ultraviolet lights have been demonstrated to
be an effective control measure for controlling
disease germs for which such control is necessary,
like medical care facilities. The use of UV light as
an air-cleaning tool in such environments is
both justified and desirable.
The problem with UV light is the same damage
of the destruction of the microorganisms has a
chance to occur to humans skin and eyes.
Some UV air purifiers without shielding
direct ultraviolet light from escaping the inside of
the unit lay down a potential danger to hurt
the skins and eyes of the users.
Super absorbing and removing smells ability
The active carbon super absorbing and
removing smells ability: Efficient active carbon
net sponge is just like the sea alga will instantly
remove the smoke in the room, formaldehyde,
ammonia, carbon monoxide etc, In the meanwhile,
will absorb the dusts.
No side effects of active carbon have been found.
Photocatalyst (TiO2) is a semiconductor that
has strong oxidation. Shining of light source can
stir up oxidation-reduction reaction on its surface,
and the surface will release free radicals, at the
moment, chain degradation reaction occurs
between the free radicals and kinds of contaminant
and bacteria each other. And the reaction can realize
the functions of air purification, anti-bacteria,
anti-dirtiness and deodorization, hydrophilic
nature, and so on.
Utilized in air purification, it can efficiently
decompose and eliminate many kinds of
organic and inorganic materials and gases
in the air.Coated on nickel foam filter,
it is efficient for long consumed without
declining with the time, and very convenient
for maintenance--the TiO2 nickel foam filter
can be washed without any destruction of its efficiency.
No side effects of photocatalyst have been found.
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