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PM2.5 Filter 10-pack
PM2.5 Filter 10-pack. Replaceable activated carbon filters.
Size: 12×8 cm. 5 layer filter. Layer 1 non woven fabric, layer 2 melt blown filter cloth, layer 3 activated carbon, layer 4 melt blown filter cloth and layer 5 non woven fabric. PM2.5 are particles smaller than 2.5 micrometers (µm). One micrometer is one millimeter divided into thousands.