Rotate Flip the unit upside down, turn the Filter Cover handle clockwise to the “OPEN” position and remove the cover. Remove Remove the multifunctional Filter from the purifier and install the new multifunctional Filter with the tabs face up and outward. Place the Filter Cover on the bottom of the air purifier, aligning the arrows to twist the handle clockwise to the “LOCK” position to secure the filters. Hold Place the air purifier on a horizontal surface before plugging it into a power socket. Hold the power button to enter ready mode. Air Purifier True HEPA Air Purifier Replacement Filter - 1-Pack Air Purifier Replacement Filter - 2-Pack Air Purifier Ionic HEPA Air Purifier Replacement Filter Buying Options Buying Options Buying Options Buying Options Add to Cart Customer Reviews 4.6 out of 5 stars 3,721 4.7 out of 5 stars 772 4.6 out of 5 stars 1,234 4.3 out of 5 stars 3,116 4.5 out of 5 stars 1,178 Price — no data — no data — no data — no data $19.99$19.99 Quantity 1 1 pack 2 pack 1 1 pack Material Pre filter + HEPA + activated carbon Pre filter + HEPA + activated carbon Pre filter + HEPA + activated carbon Pre filter + HEPA + activated carbon + ion booster Pre filter + HEPA + activated carbon + ion booster Filter lifespan no data Up to 2100 hours Up to 2100 hours no data Up to 700 hours Dimensions 7.87 x H 12.8 in 7.56 x H 2.48 in 7.56 x H 2.48 in 6.7 x 6.7 x 7.5 in 6.7 x 6.7 x 7.5 in