Decide how much you are concerned about noise. Different air cleaning devices operate at different levels of noise, it is necessary to take into account when choosing Bionaire air purifiers, because they use a different technology to work, on which depends their noise.
There are two principles of operation of air purifiers:
1) Hydro-Filtration Technology – that is creating a multi-tiered water curtain, when there is a conical water rotates in center of the tank, lifting up water, thus creating, above the water curtain of fine droplets through which the contaminated air. This technology is more noisy.
So, deciding to choose air cleaning units with this technology, be prepared for a noticeable noise. We can not say that it was very worried, but sensitive people can interfere with sleep.
2) Creating a "water bath" by whirling water disks covered with droplets of water: the water is delayed by plastic disks thanks to the special relief (Air-O-Swiss, Boneco, Electrolux, Ballu, Bionaire air purifier systems) or membrane between the discs, creating water film. Top disks blown by a powerful fan, enhancing evaporation. With this technique the noise level depends on the fan noise.
Decide whether you necessarily need a built-in air ionizer or you are willing to purchase it separately.
Manufacturers strive to make the air cleaners the most simple, to increase their reliability and increase service lifetime. For example, Bionaire air cleaning systems manufacturer gives a guarantee of 10 years, and there are already Bionaire air purifiers, which operate 15-20 years. Any electronic system shortens the lifetime service, for example, most of the air purifier with electronic control is designed for 5-7 years of service. That is why not all the air cleaners have additional features such as photocatalysis and ionization.
Ionization is certainly badly needed in the present circumstances, when we have to spend most of our life indoors, where the air is devoid of negative ions, able to maintain a high level of immunity, relieves us from rapid fatigue and reduce attention and memory. That is why, when choosing air cleaning unit you should decide whether you want to receive a maximum of functions in a single air cleaner, knowing that it will last you less, or you are willing to buy a separate air ionizer and choose an air cleaner without ionization, which will work for you a long time.