Globe Technologies Corporation - The World's leading manufacturer of high quality fusible links used in the fire protection industry. It is another object of the present invention to provide a novel motorized smoke and fire damper incorporating cable means which are continuously tensioned by a motor to normally retain the damper blade assembly in an open condition and which automatically acts to release the blade assembly upon de-energization of the motor.
We provide links that offer fusing temperatures from 135 degrees F to 500 degrees F with various load ratings, links that can respond to thermal fusible links for fire dampers conditions with either low cost single use links or can be resettable multi-use along with a range of electro-thermal release devices.

British Standard 9999:2008 Annex W.1 gives clear guidance that all fire dampers should be tested at regular intervals not exceeding 2 years and that spring operated fire dampers should be tested every 12 months and at greater frequencies if in a dust-laden environment.
According to the BS9999 Fire Damper Regulations, arrangements should be made for all fire dampers to be tested by a competent person on completion of installation and at regular intervals not exceeding two years (HTM03-1 requires hospitals to have their dampers tested every 12 months).
Arrangements should be made for all fire safety equipment, installations and systems (including fire detection systems, automatic suppression systems, door control mechanisms, smoke control systems, evacuation and fire-fighting lifts, emergency lighting, standby power systems, escalators, and all passive fire protection provisions) to be inspected and tested on a regular basis by a competent person.

5. When the blades are in the compacted position 32, the blade assembly 20 defines a damper opening 36 through the frame 12 of sufficient size to normally permit passage of the air stream from an air conditioning, heating or ventilating duct system 120.
5. The smoke and fire damper of claim 3 wherein the initial diameter of the first spring is great enough to permit the hub of the pulley to slip relative to the untensioned first spring when the cable tensioning means is functioned to its said second position.