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Rungs of retractable exit ladder devices shall be capable of withstanding 1,000 (4448 N) when applied to a 31/2-inch-wide (89 mm) block resting on the center rung as near the side rail as possible. The test load shall be applied for a period of one hour. Upon removal of the test load the fasteners attaching the rung to the side rail shall show no evidence of failure. The ladder shall remain operational following the test.
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