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Motor-driven opening and
closing
This type of operator is chosen in all situations
not requiring the spring-operated version. It comes into its own
particularly for outdoor installa-tions in conditions of strong
wind blowing in the opposite direction to that of door closing.
In fact, a spring-operated operator would not permit the door to
be so easily closed or kept closed under such conditions, thus causing
consi-derable inconvenience.
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