| http://www.w3.org/ns/prov#value | - Also, in addition to gathered stainless steel wires, the filters 33, 63 and 65 can be made of a material that has a permeability for the exhaust air 5 to flow through, can remove contaminants in the exhaust air 5 and is not damaged by contact with the cleaning liquid 40, but for used at a place such as a kitchen where are heat load is applied, a material that do not easily cause corrosion and rust
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