About: http://webisa.webdatacommons.org/285022810

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	It is desirable for the walls of the duct to be made of an electrically conducting material such as aluminum or steel so that any electrostatic field present will be substantially uniform across the interior surface of the duct.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au