| http://www.w3.org/ns/prov#value | - (a) inserting a filter element having a first and second opposite flow face and a sealing system into a duct; the filter element having a longitudinal axis passing through the first flow face and the second flow face; (i) the sealing system including a frame construction and a seal member; the frame construction including an extension projecting axially from one of the first and second flow faces
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