Nispira premium filter set compatible with Blueair Blue Pure 121 Large Air Purifier for 620 SQ.FT High quality HEPA filter captures 99.97% of airborne particles size down to 0.3 microns. Activated charcoal filter helps deodorize any unfavorable household smell and removes chemical VOCs 3 Filter included. Flat dimension: 19.37" x 20.25"x 3". Expanded dimension: 11.6" x 11.6" x 19.37". Suggested to replace every 6 months for best performance. 100% customer satisfaction guaranteed. Quality meets or exceeds leading national brand
