With up to 30 minutes ~ 240 minutes fire resistance
	Integrity & Insulation
	Tested to BS476: Part 24 & AS1530: Part 4 requirement

Selection of board thickness in accordance with F.R.L. & Operating Pressure requirements.
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Duct span maximum up to 10 metres wide

The above construction of self-supporting fire resistant encasements around is up to 10m wide. Please consult Promat Technical Department for duct width over 3m.
For impact resistant systems in accordance with the criteria BS5669: Part 1 exposed to external and internal fire, 52mm thick PROMATECT®-L500 boards are required. Insulation will be as Duct type B (exposed to internal fire).

PROMATECT®-L500 self-supporting ducts must be supported at maximum 1250mm centres, located to coincide with joints, or to one side of joint. No protection is required to the support angle or channel unless each hanger is more than 50mm from the duct sides. In this case, the support section should be clad as shown above. Vertical duct runs normally require to be tied back to an adjoining masonry wall using threaded rods and angle or channel support section at maximum 3000mm centres.

Option fixing

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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