Filters

HEPA Filters

Hepa Filters

EPA Filters stands for High Efficiency Particulate Air. It works on diffusion principle to remove particulate matter and it is also important in maintaining the contamination control. The HEPA filter particles as 0.3 µm (microns) with a 99.97% minimum particle-collective efficiency. This is remarkable by considering the outside air we breathe that contain upto 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 when clean and generally need to be replaced when the pressure drop exceeds 2 inch.

HEPA Air filters are not MERV rated as they exceed the ASHRAE test protocol 52.2 used in determining the MERV ratings. In fact, HEPA air filters are the only mechanical air filters 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.

Fine Filters:

  • Efficiency is 95% @ 1 microns
  • Operating Temperature is upto 100⁰C
  • Operating Humidity is upto 100% RH
  • Filtration Rate is upto 99% down to 5 µm

Pre Filters

  • Efficiency is 90% @ 10 microns
  • Operating Temperature is upto 100⁰C
  • Operating Humidity is upto 100% RH
  • Filtration Rate is upto 90% down to 10 µm