Filter assembly having a disposable pre-filter
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United States of America Patent
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Sep 25, 2001
Grant Date -
N/A
app pub date -
Oct 4, 1999
filing date -
Apr 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filter assembly for use in an air filtration unit, particularly for filtering cooking vapors. The assembly includes a filter disposed across an air flow and a grease pre-filter located upstream of the filter. The grease pre-filter is formed principally from wool fiber having an approximate density of 150-200 g/m.sup.2 and a loft of substantially 15-20 mm. The use of such a pre-filter substantially prolongs the service life of the filter before cleaning is required.
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