Patent ID: 7316729

Claim:
An air cleaner, comprising: a base portion; an elongated tower portion extending substantially vertically above the base portion and including a shell, at least one door, and a control panel; a substantially vertical air duct inside the tower portion and including an inlet end and an outlet end, wherein an airflow travels in a substantially vertical fashion from the inlet end to the outlet end; a pre-filter positioned at the inlet end, wherein the airflow first encounters the pre-filter; an electrostatic precipitator positioned in the air duct downstream of the pre-filter, wherein the airflow encounters the electrostatic precipitator after encountering the pre-filter; a post-filter positioned in the air duct downstream of the electrostatic precipitator, wherein the airflow encounters the post-filter after encountering the electrostatic precipitator; and a fan unit positioned in the air duct downstream of the post-filter, wherein the airflow encounters the fan unit after encountering the post-filter; wherein each of the pre-filter, the electrostatic precipitator, and the post-filter can be separately installed and removed from the air duct.