Assertion: centrifugal fan | /r/MadeOf | ducted housing
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower fan, biscuit blower[citation needed], or squirrel-cage fan (because it looks like a hamster wheel).