Bionaire BAP1700-U PERMAtech Tower Air Purifier with Timer and Air-Quality Sensor Air purifier with space-saving tower design for rooms up to 170 square feet PERMAtech filter with HEPA media removes up to 99-percent of airborne particles 3 speed settings; optional ionizer; programmable timer; built-in air-quality sensor Filter-service indicator; CADR of 110 for smoke, dust, and pollen Measures 11-1/6 by 8-2/9 by 29-5/8 inches