| http://www.w3.org/ns/prov#value | - A hollow impermeable wall shell 1710 (made from any suitable material such as DuPont's TYVEK if flexible design or hard metallic shell, e.g. aluminum or steel, if rigid design) has one end 1712 tie wrap connected to the opening in inlet flange 1702 and exit/second end 1714 connected to the inlet end 1727 of a last stage permeable catalytic media 1728 (prepared as previously described).
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