Product Description:Premium 3-in-1 True HEPA + Activated Carbon filter compatible with Bissell Myair Pro air purifier 3139A and Hub purifier 2905A. Compared with part 3069 and 3389. High quality HEPA filter capture 99.97% of airborne particles down to 0.3 microns. Activated Carbon captures household unfavorable Odors & harmful VOCs 1 filter included. Suggest replacing the filter every 4 - 6 months the most to optimize the performance. Size 6.1" x 6.1" x 6". Quality meets or exceeds the leading brand