If you have done any amount of research on today’s vacuum cleaners you will already know that the vast majority of them come with some form of a HEPA filter. This is probably the most important technological advancement in the industry over the last 20 years. The awareness of the dangers of indoor allergens has forced the companies to improve their products and today you can purchase a machine that can remove more than 99% of such harmful products as pollen, mold spores, pet dander, and dust mites. While this is especially important for those individuals who suffer from asthma or allergies it also helps all family members breathe easier while relaxing in the home.
In order to be rated at removing more than 99% of allergens the vacuum cleaner must move all the air that is drawn in through the filter without any amount of leakage. This is sometimes referred to as a Sealed System, but it is important that the machine has this design. Even though the United States Department of Energy requires these filters to be rated at removing at least 99.97% percent of all particles 0.3 microns in diameter, if ALL the air doesn’t pass through them then they really aren’t that effective.
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