Assertion: natural ventilation | /r/HasProperty | preferred
Facets:
value: because of its simplicity
type: CAUSE
value: because of minimal operating costs
type: CAUSE
Source sentences:
text: Fans are not often used in cattle barns as natural ventilation is preferred because of its simplicity and minimal operating costs, but fans can be useful in older two storey barns to exhaust stale air where natural ventilation isn't possible.