182550 Replacement Filter Compatible with Bionair BAP536UV-U Air Purifier and Holmes HAP537UV / 2141139 Air Purifier, 2 H13 True HEPA and 6 Carbon Pre-Filter

182550 Filter Dimension: 20.47" x 4.72" x 1.37". | Compatible with Bionair BAP536UV-U Air Purifier and Holmes HAP537UV Air Purifier, Replacement Part # 182550. | Include 2 H13 True HEPA filter and 6 Carbon Pre-Filter. We recommend you to replace the hepa filter every 6-8 months and pre-filter every 2-3 months. | H13 True HEPA which effectively attaches at least 99.97% of airborne particles as small as 0.3 microns in the air, Carbon Pre-filter help reduce common odor from pets, smoking and cooking.