The FPF30UH Air Purifier by SHARP is your choice for small rooms. Effective up to 690 sq. ft. at one air change per hour, the FPF30UH will filter the air in the AHAM Suggested Room Size of 143 sq. ft. at 4.8 air changes per hour. The SHARP long-life True HEPA filter lasts up-to 2 years, depending on the environment. The FPF30UH meets the strict energy efficiency criteria to earn the ENERGY STAR Rating. The double filtration system helps clean the air that passes through the filters in two ways. The washable, microscreen pre-filter traps dust and other large airborne particles. Next, the True HEPA filter effectively captures 99.97% of particles from the air that passes through the filter from 0.3 microns and larger. The FPF30UH is AHAM Verifide Tested and found to provide a Clean Air Delivery Rate (CADR) for three common irritants and allergens, Smoke (92), Dust (101), and Pollen (109). It is certified by the California Air Resources Board (CARB) to meet its strict emission standards.