About: http://webisa.webdatacommons.org/396287243

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	If material other than galvanized metal is used in parts of the system, you will have to adjust for the difference in the material's roughness factor.
http://www.w3.org/ns/prov#wasQuotedFrom	ventilationdirect.com