For starters, HEPA stands for High-Efficiency Particulate Air. But what exactly is a HEPA filter? Simply put, this is a type of filter that's capable of trapping very tiny particles. Vacuums that don't have this type of filter will just recirculate the small particles into the air.
Vacuums that have a HEPA filtration system are ideal for reducing dander, dust, as well as common allergens that occur in homes. They work best for people that suffer from some respiratory conditions, or those who have allergies.
There also exist true or absolute HEPA filters. Such filters have undergone numerous tests to make sure they meet specific standards. Their filtration system can trap up to 99.97 percent of tiny particles of about 0.3 microns. The filtration performance of such vacuums is usually indicated in the product's description.
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