A HEPA air filter, which is found in most purifiers, can reduce the amount of airborne allergens and, therefore, help to ease the discomfort of allergy sufferers. HEPA, which stands for High Efficiency Particle Arresting, is known to help remove mold spores, dust mites, dust, pet dander and other allergy inflaming particles. Even if a person does not suffer from allergies, they will benefit from not having to breathe in such harmful allergens. The HEPA air filter is found is in the vast majority of small, lightweight and portable air purifiers.

Air filters provide natural air with a way for it to be pulled in and sent through a pre-filter, which traps large air particles. After that, the air continues to pass through additional filters, such as HEPA or carbon, before being released back out into the home. The result is cleaner, fresher air for both children and adults. HEPA filters are extremely popular among air purifier owners, in part, due to the fact that they have been shown to remove up to 98% of airborne particles. The result is the most efficient filtration system available. A general rule when buying a home purifier is that the more filtration it offers, the cleaner the air.

When browsing the home section of any store, either retail or online, it is nearly impossible not to see air filters or purifying units. Such products, especially those containing a HEPA filter, can be very expensive depending on the brand and size of the unit. Portable filtration units often range from $30.00 up to $200.00, but a larger unit may cost more.

When purchasing an air purifier, take a moment to read the warranty. Almost every unit will be accompanied by a warranty card or registration information. It is a good idea to keep this paperwork tucked away in a safe place for future reference. In addition, retain the owner's manual for manufacturer contact information and required maintenance and troubleshooting with the unit.

It is important to remember that, in order to continue working properly, an air filter must be changed regularly. This is a simple process that usually involves disassembling a part of the purifier, removing the old filter and sliding a new one in it's place. It is important to select an air purifier that offers replacement air filter cartridges, which can either be ordered through the manufacturer or sold at a local department store. If the unit that you choose is not a common, well-known brand, it may be difficult when it comes time to replace the air filter. When attempting to replace a filter cartridge, it is important to follow the manufacturer's instructions as to the details on caring for the unit. How often should the air filter be changed? How much assembly is involved during the process? The answers to these questions will vary depending on the unit.