Intumex Asia Pacific

Where Fire Stops

Self-supporting duct

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MONOLUX^® - Self supporting duct

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.

Fire resistance (BS 476: Part 24: 1987)		Board thickness (mm)	Dimensions of duct (mm)	Rock wool (thickness x density)
Stability & integrity (minimum)	Insulation (minimum)	Board thickness (mm)	Dimensions of duct (mm)	Rock wool (thickness x density)
240	30	25	Up to 4000 wide x 1500 high	-
240	240	25	Up to 3000 wide x 1500 high	100mm x 100kg/m³
120	30	19	Up to 4000 wide x 1500 high	-
120	120	19	Up to 3000 wide x 1500 high	50mm x 100kg/m³

Note that all joints in the duct are filled with one of the following sealants:

Potassium silicate / MONOLUX^® dust mixture
Potassium silicate adhesive
INTUMEX^® AN acrylic intumescent sealant

MONOLUX^® 40 boards, thickness in accordance with the table above.

Galvanised steel angles or channel stiffeners, dimensions dependant on fire resistance performance requirements of duct. Please consult Intumex Asia pacific for details.

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.

Self drill, self tapping screws at nominal 200mm centres.

Galvanised steel angle at corners, 30mm x 30mm x 0.6mm for two hours, 1.2mm for four hours performance.

Galvanised steel hanger support system, maximum stress levels should not exceed 10N/mm² or 6N/mm² for two and four hour systems respectively.

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.

Rock wool seal to maintain insulation performance at penetrations.

Compartmentation, performance of the duct should be at least that of the separating element.

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.

120 and 240 minute self-supported duct enclosure

120 and 240 minute insulated self-supporting enclosure

* For more detail, roll your cursor over the individual numerals in the two drawings above.

Note:
Additional items for consideration where ducts exceed 2000mm width or 1500mm depth:

The ducts should be installed incorporating additional threaded rods internally to act as stiffeners. These rods should be installed such that the maximum unsupported distance does not exceed 1200mm.

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