An allergy filter acts as a cleaning mechanism

The most widely recommended allergy filter is the HEPA (High Efficiency Particulate Air) filter. Designed originally to keep radioactive particles out of the air, it is considered the most efficient today as it can filter just under 100% (99.97% to be exact) of all 0.3 micron particles, which are smaller than the size of most bacteria. That is why a HEPA filter is an excellent allergy filter rendering the indoor air free of allergens. If you are keen to purchase a HEPA filter, look for the genuine brand as many cheaper imitations are now available in the market.

A number of ionization air filters have been found to generate ozone, which is a proven health hazard and lung irritant. The Environment Protection Agency (EPA) has come out strongly against the use of ozone generators as air filters.

You should be extremely careful while choosing your allergy filter as a wrong decision in this regard may aggravate the problem by agitating and circulating the existing allergens throughout your house.