HEPA Filters

HEPA (High Efficiency Particulate Arrestance) filters capture a minimum of 99.97% of all particles .3 microns in diameter or larger. These filters are among the most efficient air conditioner filters available. At over 99 percent efficient, a HEPA air filter will remove almost all allergens from the air passing thorough your AC equipment. HEPA air filters remove dust mites, pet dander, pollen, mold spores and other household allergens.

A HEPA filter is very similar in design to pleated filters except for some very important differences. Hepa filter material is different than that used in regular pleated air filters, and there are more pleats per inch of filter than in standard pleated filters.  

Additional pleats increase the surface area available to hold particulates and reduce the frequently filters need to be cleaned or replaced. Having more pleats per inch enables the filter to remain in operation longer because dust tends to collect in the lowest point between the pleats. This means it will take longer for air flow to be reduced through the filter.