About: http://webisa.webdatacommons.org/37675618

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In this context, freedom of flow means that in any desired cross section it is possible to see through at least 20% of the area, i.e. at least 20% of the area is free of internals such as, for example, the vanes 6 or the like.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com