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Are areas outside the fire resistance enclosure of a Major Vertical Penetration considered part of that penetration? For example, plumbing chases behind restrooms?

April 26, 2017areas Enclosure outside penetration plumbing resistance vertical

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Are areas outside the fire resistance enclosure of a Major Vertical Penetration considered part of that penetration? For example, plumbing chases behind restrooms?

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Walls enclosing the major vertical penetration, which are required by building codes, are part of the penetration. Additional walls outside these enclosing walls are not considered part of the penetration and are not deducted from Rentable Area.