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What effect will arise from variations of duct geometry and orientation on test results?

April 26, 2017arise duct geometry Orientation results Test variations

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What effect will arise from variations of duct geometry and orientation on test results?

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ANSWER [a] A test result for fire resisting horizontal ducts is applicable to horizontal ducts only. [b] A test result obtained for fire resisting vertical ducts is applicable to vertical ducts without a horizontal branch. [c] However, for fire outside ducts, if a test is successfully made on a horizontal duct with a branch, for a stated period of fire resistance, then vertical ducts may include a horizontal branch for that same period of fire resistance.