Air filter unit with at least one main air filter and an auxiliary filter
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United States of America Patent
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Jun 26, 2012
Grant Date -
Feb 25, 2010
app pub date -
Apr 18, 2007
filing date -
May 29, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In an air filter unit (10) comprising at least one main air filter (1) and an auxiliary air filter (2) that is connected by an air conduit (3) to the main air filter (1) and has at least one auxiliary filter element, the auxiliary filter element is formed, at the unfiltered air side of the main air filter (1), by an at least partially porous wall of the air conduit (3) closed off at the intake side. In the reverse case, when installing at the filtered air side, the auxiliary filter element is arranged within the air conduit connected to the main air filter.
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