About: http://webisa.webdatacommons.org/229167930

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	4Make sure the small space has enough clearance around the unit to provide easy access to gas and electrical connections and for such maintenance as changing air filters, if those are not installed in the house.
http://www.w3.org/ns/prov#wasQuotedFrom	sfgate.com