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| Fire Duct Systems |
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Standards and approvals |
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The requirements for ductwork fire protection
Three performance criteria; stability, integrity and insulation, are required in equal measure for all ducts which pass through fire-rated walls or floors.
BS 5588 – 9, Clause 6.2.5.3 requires that, for fire-resisting ductwork:
‘The fire resistance of the ductwork, when tested from either side, should not be less than the fire resistance required for the elements of construction in the area through which it passes’
BS 476 – 24, Clause 9.1 states that:
‘The fire resistance of test specimens shall be the duration in minutes, of heating in accordance with 5.1.1 until failure occurs according to one or more of the performance criteria, ie, stability, insulation, integrity, or until the test is terminated, whichever is the shortest time’
Fire Duct System test data
The Fire Duct products have been tested and assessed by BRE LPC in accordance with BS 476 – 24, ‘Fire tests on building materials and structures – Methods for determination of the fire resistance of
ventilation ducts’.
Fire Duct products can be used to provide fire protection to horizontal, vertical, rectangular, circular, ventilation and smoke extract steel ductwork fully in accordance with BS 476 – 24, ducts ‘Type A’ and ‘Type B’, “Fire outside duct” and “Fire inside duct”.
The ½, 1, 1½ and 2 hour periods of fire resistance stated in this manual are for stability, integrity and insulation in equal measure. For example, the 60 minutes duct constructions shown are certified for 60 mins stability, 60 mins integrity and 60 mins insulation .
‘Kitchen extract’ ducts
These are subject to separate BS 476–24 requirements, and are
additionally covered for 1⁄2 and 1 hour protection periods.
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Rockwool Limited, Pencoed, Bridgend, CF35 6NY, UK
| 01656 862621 |
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Copyright © Rockwool Limited, Disclaimer |
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