Thern’s Fire Vent Closure Winch does not break the Electro Thermal Link that automatically releases vent doors in the event of fire or smoke alarm.
Most theatres are required to be equipped with fire vents. At present, many of these vents are operated with hand winches or other types of equipment not specifically designed for that purpose. In particular, they are not easily inspected and tested–a procedure that should be done frequently. Thern’s Fire