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Clause 4.1 General Clause 4.2 Position Clause 4.3 Accessibility Of Ventilation Sleeves Clause 4.4 Fragmentation Plate

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Clause 4.3 Accessibility of Ventilation Sleeves

TRSS 2021

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4.3.1 Clearance in front of and around Fragmentation Plates

a. The minimum clearance from the fragmentation plate to RC beam or structure or service shall be 50mm. Where the RC beam or structure or service is fronting the fragmentation plate of ventilation sleeve, the clear distance between them shall be at least 500mm. Refer to FIGURE 4.3.1(a).

b. In additional, there shall be a minimum unobstructed distance of at least 700mm from the face of the VS openings to the nearest face of any other internal structural elements within the SS, e.g. any protruding parts of a staircase. Refer to FIGURE 4.3.1(b).

4.3.2 False Ceiling below Ventilation Sleeves

Where false ceilings are provided outside the SS, S/C SS or scissor S/C SS and below the ventilation sleeves, there shall be one access panel of a minimum size of 600mm x 600mm positioned directly below each ventilation sleeve. In the case of SS, one of the access panels shall be perforated and the ventilation sleeve above it shall be left open during peacetime. Refer to FIGURE 4.3.2.