WebMD Answers
You can find HEPA filters in most air purifiers. These are small, portable units that may work for a single room. If you are considering buying a HEPA filter, find out the capacity that the filter can clean. Be sure you buy one that is big enough for the room where you plan to use it.
The best room for a unit is the one where you spend most of your time -- usually your bedroom. You can find HEPA filters in most home improvement stores or through allergy supply dealers.
Some vacuum cleaners are equipped with HEPA filters, which are designed to trap more dust from their exhaust airstreams. HEPA-equipped vacuums exhaust less dirt and fewer microscopic dust mites back into the room as you vacuum. Some people say allergy symptoms improve after using these specially equipped vacuums.
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