About: http://webisa.webdatacommons.org/45211639

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	To avoid this problem and other problems said filter 25,26 is provided in an inlet end thereof with a valve that will allow extraction air to enter but will prevent any air going in the reverse direction.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com