Hepa Filters

Written by Norene Anderson
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HEPA (High Efficiency Particulate Arresting) filters are effective for capturing as much as 99 percent of particulates as small as 0.3 microns. Even with this efficiency, gas molecules still get through a HEPA filter. These molecules require an added layer of activated charcoal or carbon to trap and hold the gaseous content of the air.

HEPA filter media consists of a tightly woven screen of fibers. The air carrying particles will lose the particulates as it passes through the screen. Pollen, dust, bacteria, and mold spores will be trapped by the filter media. This is a great help to individuals suffering with allergies and asthma.

Uses for HEPA filters

For room-size air cleaners, it is important to match the size of the HEPA filter with the size and air content of the room. The air must be drawn through the filtering system. If the room is larger than what the unit is rated for, the air furthest away may not be pulled into the unit. If the HEPA filter is placed on a forced-air unit for the whole house, the suction of the return vents will circulate all of the air in the room.

A HEPA filter alone will not eliminate all of the irritating components of indoor air. It is sometimes necessary to use a combination of filter types to have complete coverage for every element. HEPA filters are designed to be energy saving while efficiently cleaning the air. HEPA filters are a standard in hospitals, nuclear facilities, food industries, and homes. The same quality of air you expect in a hospital surgical suite can be in your home. The cost is easily offset by the savings in utilities and the health benefit of breathing clean air.


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