With up to 120 minutes & 240 minutes fire resistance
	Integrity only
	Integrity & Insulation
	Tested to BS476: Part 24 & AS1530: Part 4 requirement

The above construction of self-supporting fire resistant encasements around is up to 10m wide. Please consult Promat Technical Department for duct width over 12m. For impact resistant systems in accordance with the criteria BS5669: Part 1 exposed to external and internal fire, 20mm or 25mm thick PROMATECT®-H boards are required. Insulation will be as Duct type B (exposed to internal fire).

	With up to 120 minutes & 240 minutes fire resistance
	Integrity only
	Tested to BS476: Part 24 & AS1530: Part 4 requirement

Self-supporting ducts provide an economical and fire safe method of constructing natural and mechanical smoke extract and ventilation ductwork without a steel lining. Lengths of the system can be prefabricated off-site or constructed on site using the applicable board type. This ensures that time spent on site is kept to a minimum, with little or no disruption to other trades.

Duct span maximum up to 10 metres wide

For selection of board thickness, it will not only depend on the required fire performance but also on the internal cross section of the duct and the operating pressure(s). With large ducts and medium to high operating pressures, internal stiffeners may be required.
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