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The door fan is temporarily installed in a doorway leading from the protected space (or test room) to a large open area or outdoors. The fan speed is adjusted to obtain a pressure between the test room and the volume surrounding the test room.
The computer predicts a time for the descending interface to reach the minimum protected height. Or, if there were continual mixing during the retention period, for the concentration to fall to the minimum that would prevent re-ignition after the hold time.
When halon 1301 came on the market in the 1960s it was rightly seen as the most effective gaseous fire fighting agent ever developed. It found widespread application in the protection of data processing rooms, telecommunications switches, art and historical collections, process control rooms, and many others.
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