Holmes HEPA Type Tower Air Purifier with Optional Ionizer,  HAP412N-U HEPA type filter helps remove up to 99% of airborne particles as small as 2 microns from the air passing through it Filter is enhanced with Arm & Hammer baking soda to help eliminate common household odors Optional ionizer assists in particle removal 3 speed settings provide options for different conditions Recommended for rooms up to 120 sq ft (10ft x 12ft), Smoke CADR 76 Filter: Any Holmes AER1 Series, Holmes HAPF300D-U2 TRUE HEPA or Holmes HAPF30D-U2 HEPA Type Filter