Ionization is a newer technique with many developments. It is an innovation that is used more and more often, for example from the point of view of sustainability and energy saving.
There are many air cleaners on the market that use ionisation. There is a difference between air cleaners that use positive ionisation and negative ionisation. Ionisation (positive or negative electrical charging of atoms or molecules) provides ions that, when attached to dust particles, produce charged dust particles. Loaded dust particles then stick more easily on all kinds of surfaces.
In addition, there is another difference in air cleaners with ionisation, namely air cleaners that charge electric particles (without filter) and air cleaners that charge electric particles, but also capture them immediately. The first is called open ionization (1) and the latter is called closed ionisation (2):
(1) Open ionization:
The charged particles are spread into the room and they themselves look for a surface to be deposited. They thus deposit on all surfaces in the room such as furniture, ceiling, walls, appliances, but certainly also our lungs. These systems create many charged particles, but also free ions, which are often negatively charged. This is then called negative ionisation. Negative by-products are also created in negative ionisation, such as ozone, free radicals and free ions. Although they contribute to reducing odor, they are also harmful to health. Research shows that charged particles can settle into lungs up to 5 times more easily than non-charged particles.
(2) Closed ionization:
The charged particles are captured on a special surface in the system itself, so that no particles are blown into the room and can therefore not settle on other surfaces. With closed ionisation, there can be both positive and negative ionization. The capture surface can be of various materials, such as conventional filters, metal plates or special open structure filters. The advantage with air cleaners that capture particles with a special open structure filter, is that it does not become clogged and less energy is needed to move the air through this filter. A good example of air cleaners with an open structure filter are the ASPRA air cleaners from VFA Solutions B.V.
Part of the odors are removed by the capture of particles. For specific and targeted odor removal, VFA Solutions additionally applies an extra special gas adsorption filter directly behind the ASPRA open structure filters. This gas filtration section is specially selected on the basis of the type and concentration of the gases and odors present and can differ per industry and even per customer. By placing VFA gas filters behind the ASPRA particle filters, the gas filters are protected against dust, making them more effective and have a longer service life.