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Why is the USG J-Runner 24 ga.?

April 26, 2017GA usg

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Why is the USG J-Runner 24 ga.?

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Elevator shaft walls are considered working walls. By that, they flex both inward and outward as the elevator passes by. This flexing causes the runner track to fail due to fatigue. Tests have shown that to oscillate one million cycles the gauge of the runner has to be increased to 24.