Many vacuum cleaners are equipped with a so-called HEPA filter, but is that really add value? Read here what to look here.
If you have a little information before purchasing a new vacuum cleaner, you stumble again and again about the so-called HEPA filter. That sounds a good, high quality and for clean indoor air, but hardly anyone knows what is behind it. In addition, Hepa Hepa is not equal, because that can qualitatively very different filter classes are called.The term Hepa So says first little about the actual filter quality, but merely shows that this is a filter of a certain size – a high efficiency filter.
HEPA were middle of the last century, developed in parallel to the atomic bomb, to filter so the radioactive particles reliably from the air can. Here is purely physical and not to set us all known screening action (particles remain simply because of their size in the filter material hanging), but other effects can be exploited. Specifically, these are the inertia effect (larger particles do not follow due to its own inertia to the airflow and remain instead in the filter), the blocking effect (particles of a certain size are liable due to adhesive forces on the filter material) and the Diffusion effect (very small particles follow the airflow due to the Brownian motion and not instead remain on the fibers of the filter material adhere). Overall, this technique thus ensures that even the smallest of particles sucked, just as few are able to slip through the filter. So what the vacuum cleaner sucks once, thus remains in the vacuum cleaner and the vacuum cleaner bag.
Various filter classes
Unlike normal fine dust filters can Hepa Filter, particles smaller than 1 micron are staying. This concerns, for example, germs, viruses, bacteria and even tobacco smoke constituents and depending on the filter class percentage more or less of these particles can be deposited. The usual filter classes H12 to H14, and these have separation efficiencies of 99.5% (H12), 99.95% (H13) and 99.995% (H14). Under the separation of a filter is the ratio between the recorded amount and deposited amount. So when the vacuum cleaner is the ratio eingesaugtem and actually einbehaltenem in device dust. Most vacuum cleaners with Hepa filter is H13 filter, so such devices blow a maximum of 0.05% of the sucked particles with the exhaust air back into the room.
Hepa for all?
The great advantage of such devices is particularly evident when people with asthma or allergies live in the house.Only in this way can, for example, pollen, dust mites or remove other triggers effectively. Of course it is done not only with a corresponding filter, and the vacuum cleaner itself must be specially sealed because the particles otherwise at weak points but can emerge again. So if you will upgrade a cheap sucker for 40 euros with a Hepa filter, improved hygiene is not guaranteed. But even with the best vacuum cleaner is that allergy sufferers should never suck itself. Instead, they should leave the premises as long as they enter and again after the cleaning and a thorough airing.