About: http://webisa.webdatacommons.org/284633335

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	Although not shown in the drawing, the vents preferably have a mechanism to adjust them open or closed such as a sliding or rotating mechanism.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com