| 摘要 |
Amongst other things, there is provided an air filter that is for use in a duct having one or more walls. The air filter comprises a peripheral frame that includes a substantially resilient and compressible casing, and a substantially rigid internal skeleton within the casing. The air filter also comprises a filter element attached about its entire perimeter in sealed relation to the casing of the peripheral frame. The filter element is adapted to remove contaminants from air passing through the duct. When the air filter is in use, it is positioned in the duct such that the casing of the peripheral frame is compressed against the walls of the duct in substantially air-sealed relation therewith.
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