Assertion: damper | /r/HasProperty | flap
Facets:
value: inside the tube
type: LOCATION
Source sentences:
text: The damper is a flap that drops down into the interior of the ductwork to stop the movement of air, fire and smoke within this section of ductwork from transferring to another location within the structure.
text: Think of your chimney as a tube and the damper is a flap inside the tube which closes off the chimney.