... Adjustable Airflow: 45m3/h or 25m3/h 4)Activated carbon/ HEPA filter/Pre-filter5)LED display: 2 colors (blue, white) ... and high density, filter the dust, particles in the air. 2. Powerful Crystal active carbon adsorption technologyUsing granular crystal ... , benzene, amine gas, etc..3. Hospital grade HEPA filter technologyAdopt the international air purification technology ,the most mature, ...