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Ductwork
In today's modern buildings, duct work systems are used to supply conditioned air
into areas occupied by people and electronic equipment, to extract smoke and hot
gases from varying locations, to pressurise escape stairways/fire fighting shafts
and for extract ducting from non-domestic kitchens. Some of these duct systems
serve a dual purpose, supplying air in normal use and reversing to extract mode
during fire.
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240 minute fire resistant SUPALUX®
ventilation & smoke extract duct (stability &
integrity)
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1) |
Steel threaded rod hangers, stress NOT
exceeding 6N/mm2 for
240 minutes system. For
alternative periods and other
information, please consult Intumex Asia Pacific.
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2) |
12mm thick SUPALUX® board.
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3) |
12mm thick x 75mm wide SUPALUX®
fillet.
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4) |
12mm thick x 75mm wide SUPALUX®
cover strip fixed with 32mm long
No.8 self-tapping screws at
nominal 300mm centres to both
sides of the top longitudinal
joints.
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5) |
Separating elements, e.g. walls,
ceilings etc.
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6) |
Hanger support angle/channel,
dimension depends on duct size.
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7) |
Steel channels forming framing
100mm x 70mm x 100mm x 0.9mm.
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8) |
Galvanised steel metal duct constructed
in accordance with DW 144
requirements.
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9) |
Mineral wool packing of
penetration seal.
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10) |
Penetration seal construction.
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11) |
Mineral wool to suit thermal
insulation performance
requirements.
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The annotated guides provided here are
of necessity very basic and do not cover
full installation requirements. For
additional information on the
construction of wide ducts and for
specific construction details, please consult Intumex Asia Pacific.
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NOTES:
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The installation method is for ductwork up to size 3000mm wide x 1500mm high only,
applicable to internal and
external fire exposure. Minimum sizes of steel sheet, stiffeners and sizes of angle sections are as specified
in DW144 Guide to construction of
sheet metal ducts or SMACNA Guide..
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This system using 12mm SUPALUX®
is designed to offer stability and
integrity only, the mineral wool is
included for purposes of thermal insulation, e.g. for air supply ducts. For systems offering stability,
integrity and insulation against fire, please consult Intumex Asia Pacific.
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