Measuring Opening Force
The maximum force pertains to the continuous application of force necessary to fully open a door, not the initial force needed to overcome the inertia of the door. It does not apply to the force required to retract bolts or to disengage other devices used to keep the door in a closed position. In measuring with a push-pull scale, force should be applied gradually so that the applied force does not exceed the resistance of the door. While there are instruments specifically designed for this purpose (e.g., tensionometer), a device as simple as a spring-loaded plunger or "fish" scale is effective in measuring the force required to open a door.
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