About this item Premium True HEPA with activated carbon filter and pre filter in one compatible with Pure zone 3 in 1 purifier High quality HEPA filter capture 99.97% of airborne particles down to 0.3 microns. Pre-filter and carbon filter remove any unfavorable household odor and traps the dust HEPA filter size: 8.75" x 9.12" x 1". Suggest replacing the filter every Six months the most to maximize the performance.
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