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Self
supporting duct
The MONOLUX®
self-supporting duct system provides an economical and fire safe method of construction
without needing to use a steel lining. Below are details of systems available for MONOLUX®
self supporting duct systems. |
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Fire resistance (BS 476: Part 24: 1987)
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Board thickness
(mm) |
Dimensions of duct
(mm) |
Rock wool
(thickness x density) |
Stability &
integrity
(minimum)
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Insulation
(minimum) |
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240 |
30 |
25 |
Up to
4000 wide x 1500 high |
- |
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240 |
240 |
25 |
Up to 3000 wide x 1500 high |
100mm x 100kg/m³ |
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120 |
30 |
19 |
Up to
4000 wide x 1500 high |
- |
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120 |
120 |
19 |
Up to 3000 wide x 1500 high |
50mm x 100kg/m³ |
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Note that all joints in the duct are
filled with one of the following
sealants:
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Potassium silicate / MONOLUX®
dust mixture
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Potassium silicate adhesive
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INTUMEX®
AN acrylic intumescent sealant
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MONOLUX® 40 boards, thickness in accordance with the
table above. |
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Galvanised steel angles or channel stiffeners, dimensions
dependant on fire resistance performance requirements of duct.
Please consult Intumex Asia pacific for details. |
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MONOLUX® cover fillets, minimum 75mm wide and 19mm
thickness for two hours and 25mm for four hours performance.
Alternatively use 75mm x 12mm SUPALUX® boards. |
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Self drill, self tapping screws at nominal 200mm centres. |
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Galvanised steel angle at corners, 30mm x 30mm x 0.6mm for
two hours, 1.2mm for four hours performance. |
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Galvanised steel hanger support system, maximum stress levels
should not exceed 10N/mm² or 6N/mm² for two and four hour
systems respectively. |
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MONOLUX® 40 boards forming collar at any penetration through
wall or floor, minimum 100mm x 100mm, with 19mm thickness
for two hours and 25mm thickness for four hours. |
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Rock wool seal to maintain insulation performance at
penetrations. |
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Compartmentation, performance of the duct should be at least
that of the separating element. |
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Rock wool, thickness and density minimum as per the above
table. Fixing detailed depend on overall dimensions of the duct,
please consult Intumex Asia Pacifi c for details. |
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120 and
240 minute self-supported duct enclosure
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120 and
240 minute insulated self-supporting enclosure
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* For more detail, roll your
cursor over the individual numerals in the
two drawings
above.
Note:
Additional items for
consideration where
ducts exceed 1220mm
width or 1500mm depth:
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