1.10pack of MERV 8 No Woven Pre filter, Matching for Models : AF500, Drieaz HEPA 500, BlueDri AS550 2.Easy to Replace: Remove the old filter before starting the scrubber, then replace the filter, and then reset to continue the scrubber. 3.Pre-Filter: It is the first stage in the filtration process, which can initially filter larger particles, thereby reducing the workload of the medium and high efficiency filter and extending the life of the filter. 4.Features: The filter has low initial resistance, large dust capacity, light weight, easy replacement, and good comprehensive utilization. It is an essential process for the filter system. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia