by closing air passages

Full Title

Control or safety arrangements > for purposes related to the operation of the system, e.g. for safety or monitoring > Responding to malfunctions or emergencies > to fire, excessive heat or smoke > by closing air passages

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

HEATING; RANGES; VENTILATING

Subclass:

AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING