| 摘要 |
Filter apparatus for removing contaminants from air includes a housing having an inlet opening and an outlet opening, and a fan for maintaining a flow of air through the housing from the inlet opening to the outlet opening. A first filter element removes particles greater than a predetermined size from air entering the housing by way of the inlet opening, and a second filter element removes particles of selected chemical species from air that has passed through the first filter element in the direction from the inlet opening to the outlet opening. The second filter element defines a chamber that is in open communication with the outlet opening, and the chamber constitutes a third filter element in which air is irradiated with ultraviolet light.
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