HEPA Filters Instruction Of HaoAir Tech

HEPA filters stands for High Efficiency Particulate Air. The HEPA filters work on diffusion principle to remove particulate matter. And are extremely important for maintaining contamination control. These filter particles as small as 0.3 µm (microns) with a 99.97% minimum particle-collective efficiency.

This is remarkable considering that the outside air we breathe may contain up to 5 million suspended particles of dust, smog, and pollen in one cubic foot. These filters typically use glass fiber media and are available in thicknesses of 6” and 12”. These have pressure drop of 1 inch- w.c. when clean and generally need to be replaced when the pressure drop exceeds 2 inch- w.c.

HEPA filters are not MERV rated as they exceed the ASHRAE test protocol 52.2 used in determining the MERV ratings. In fact, HEPA filters are the ONLY mechanical that are tested and certified to meet a specific efficiency at a specific particle size. All HEPA air filters must meet a minimum efficiency of 99.97% at 0.3 microns.

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