1 SELLING AIR PURIFIER! Our bestselling Ionic Comfort Quadra Air Purifier removes dust pollen and tobacco smoke from your air along with smaller atomic-sized particles that traditional HEPA air purifiers leave behind. Whisper-quiet technology lets you put one in any room C even the bedroom. And it never needs a new filter. Just clean the permanent stainless steel filter in the sink or dishwasher. Recommended for rooms up to 400 sq. ft.