Filter assembly having a disposable pre-filter
OwnerRonald Moreinventor
Life of this patent
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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/m2 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.
Claims21
A filter assembly for use in an air filtration unit comprising:
- a filter disposed across an airflow aperture and
- a grease pre-filter disposed such that airflow passes through said grease pre-filter prior to passing through said filter,
- wherein said grease pre-filter is principally wool fiber having an approximate weight of 150-200 g/m2 and a loft of substantially 15-20 mm.
A filter assembly for use in an air filtration unit comprising:
- a filter disposed across an airflow aperture;
- a pre-filter disposed such that airflow passes through said pre-filter prior to passing through said filter, said pre-filter being constructed solely or primarily of woven, non-woven or needle punched wool fiber, said pre-filter having a flame baffle and a support mesh located between said flame baffle and said pre-filter.
A grease pre-filter for use in an air flow passage of air filtration apparatus for cooking vapors, the pre-filter formed principally from wool fiber having an approximate weight of 150-200 g/m2 and a loft of substantially 15-20 mm.
A method of modifying an air filtration unit which includes a filter element disposed in an airflow passage or across an aperture into an airflow passage, the method comprising the step of:
- mounting a disposable grease pre-filter that is a woven, non-woven or needle punched blanket formed predominantly from wool having an approximate weight of 150-200 g/m2 and a loft of substantially 15-20 mm.
A filter assembly for use in an air filtration unit comprising:
- a filter disposed across an airflow aperture and
- a pre-filter disposed such that airflow passes through said pre-filter prior to passing through said filter, said pre-filter being a mix of high bulk wool fiber and a polyester fiber formed in woven, non-woven or needle punched blanket.
Dependencies are inferred from the claim text.