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<http://webisa.webdatacommons.org/216275163>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<securitysolutions.com> .
<http://webisa.webdatacommons.org/216275163>	<http://www.w3.org/ns/prov#value>	"The problem can be especially acute when air conditioning is operating, which creates a large pressure differential between a stairwell and hallway." .
<http://webisa.webdatacommons.org/prov/109559614>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/216275163> .