If you suffer from a dog allergy, a HEPA filter is a great tool in your fight against dog allergens. A HEPA filter is a High-Efficiency Particulate Air filter which is incredibly effective and can filter out 99.97% of air contaminants down to the minuscule size of 0.3 microns in size. To put that into context, pollens are usually between ten and one hundred microns in size and normal household dust is from 0.5 and 5 microns. The size of the air contaminants is important because the smaller they are, the more problems they can cause for asthmatics and allergy sufferers. Small air contaminants such as pollens and dog and cat allergens are blown around easily and are also small enough to easily penetrate the lungs and nasal passages. The first HEPA filter was launched in the 1940s and they are composed of a mat of randomly arranged fibers that effectively trap the particles moving through it. The filter itself must be washed and/or replaced regularly so always follow the manufacturers instructions for optimum performance.
So, the HEPA air filter is a valuable tool for all allergy sufferers as it effectively filters out the dander and allergens that provoke those troublesome symptoms. Some vacuum cleaners have a built-in HEPA filter to ensure that the air that is blown out of the cleaner is free from dust and allergens.