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About product: Features: fit for air purifier, help filter odors and freshen air Compatible model: for air purifier models HPA300 Series air purifiers, these pre-cut filters make it easy and quick to replace old filters. Specifications: Air purifier pre-filter size(LW): 17.2 x 14.2 inches Air purifier pre-filter thickness: 5 mm Material: activated-charcoal Quantity: 4 pieces Package includes: 6 x Air purifier pre-filters Replacement: Recommend average is 2-3 months between replacements. Note: Filter contain charcoal, please do not rinse.