| 摘要 |
An air filter system and an air filter therefore are provided for use in a building with first and second zones separated by a wall-door system having a wall with a door therein. The gap between a lower edge of the door and the floor has an air flow permitting region. An air filter is mounted to extend substantially across the air flow permitting region. In a preferred embodiment the air filter extends across a lower edge of a door and filters air that passes below the lower door edge and a portion of the floor below the lower edge.
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