Black Steel Ducts
Firemac is not aware of any test evidence to confirm the performance of unprotected black steel in fire conditions, or
any third party certification in support of any claims. It is not an acceptable form of fire protection for ductwork in the
UK and other major European countries because of this lack of test evidence.
Therefore it is important that the contractor consults with the duct supplier to review the technical specifications for
the use of unprotected black steel as a tested fire duct and ensure fabrication and installation guidelines are followed.
The extra stress the weight of this gauge of steel places on the performance of a duct, and its hangers, bearers and
anchors, in fire conditions, is substantial and contractors and consultants must satisfy themselves that this is a proven
method of fire protection, particularly at all penetrations where the greater thermal movement created by the use of
such a rigid system will cause the potential for failure and the breaking through of fire into adjoining compartments.
In addition, black steel is an expensive option, when compared to the construction requirements of Firemac FM Fire
Ducts which use mild steel, stainless steel of GI depending upon requirements. Ductworkers fabricating Firemac FM
Fire Ducts are trained and audited regularly by Firemac, full technical support is given and the performance of Firemac
FM Fire Ducts has been tested to 4 hours fire resistance. The system also listed in International Fire Consultants
Certification (IFCC) scheme and has civil defence approval in the UAE, Oman, Bahrain and Qatar.