5161 Metal wire based lining (53) Wire covering fixed to framing, battens, tracks, substrates or fixing points, over linings or to form air-permeable enclosures and screens 5163 Timber open batten & grid systems (7) Open timber batten systems with fixing systems that may consist of clips and battens/channels, that in turn fix to structure, sub-structure, frames or substrates, over linings or to form air-permeable enclosures, screens and features. Optional items may include, cloth (or similar) backing, insulation (thermal or acoustic). 5164 Metal open batten & grid systems (6) Open metal batten or grid systems with fixings that may consist of clips and battens/channels, that in turn fix to structure, sub-structure, frames or substrates, over linings or to form air-permeable enclosures, screens and features. Optional items may include, cloth (or similar) backing, insulation (thermal or acoustic). 5165 Miscellaneous open batten & grid systems (0) Miscellaneous open batten or grid systems with fixings that may consist of clips and battens/channels, that in turn fix to structure, sub-structure, frames or substrates, over linings or to form air-permeable enclosures, screens and features. Materials may be any single material (other than timber or metal), mixed materials or composite materials. Optional items may include, cloth (or similar) backing, insulation (thermal or acoustic). 5168 Miscellaneous open linings & open post-linings (0) Miscellaneous open air-permeable elements as, a lining, post-lining over linings or isolated elements such as screens and features