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SurroundAir recommends replacing every 1-2 years.
How HEPA Filters Work
HEPA air filters are made from very tiny glass fibers that are made into a tightly woven paper. This creates a filter consisting of a multitude of very small sieves that can capture extremely small particles, including some biological agents. Once trapped, contaminates and particles are not able to flow back into circulation, due to the highly absorbent pores of the HEPA air filter.
HEPA Air Filter Facts and Studies
What to Look for in a HEPA Filter
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