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7.6.2.4 - Where the curtain end zones are arranged inside another curtain adjoining the curtain; Each curtain end zone shall be extended into the curtain body by at least the thickness of the wall not less than 300 mm ( Figure 7.11 ). The cross-sectional area of the wall end zone shall be arranged such that it is not less than the area defined in 7.6.2.3 for rectangular walls .
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