Fire-rated ventilation duct and a method of manufacturing and/or installing such ventilation duct in a fire-rated ventilation duct structure penetration arrangement

Abstract

A fire-rated ventilation duct structure penetration arrangement includes a ventilation duct and a building structure, such as a wall, ceiling or floor, through which the ventilation duct extends. The ventilation duct has one or more metal sheets forming the duct. The metal sheet duct is covered on the outside by a fire protection material, and the duct includes elongated stiffening members located on the outside of the duct and attached to the metal sheets. The stiffening members are arranged substantially within the opening of the building structure.

1 . A fire-rated ventilation duct structure penetration arrangement comprising:
 a ventilation duct; and   a building structure comprising an opening extending in a longitudinal direction through the building structure, through which the ventilation duct extends;   wherein the ventilation duct is covered on an outside by a fire protection material, and the ventilation duct includes at least one elongated stiffening member attached to the outside of the ventilation duct; and   wherein the stiffening member is arranged substantially within the opening of the building structure.   
     
     
         2 . The fire-rated ventilation duct structure penetration arrangement according to  claim 1 , wherein the stiffening member comprises a metal profile and at least one non-combustible bar of inorganic material retained by the metal profile and where the stiffening member further comprises one or more of the following, that the at least one non-combustible bar is glued to the metal profile, that the metal profile is a steel profile and/or that the at least one non-combustible bar is based on gypsum, calcium silicate or cement. 
     
     
         3 . The fire-rated ventilation duct penetration arrangement according to  claim 2 , wherein the metal profile retains the at least one non-combustible bar by at least partly encircling the bar. 
     
     
         4 . The fire-rated ventilation duct structure penetration arrangement according to  claim 2 , wherein the metal profile is U-shaped with attachment sections, such as mounting flanges, so that a longitudinal groove is provided which is configured to tightly receiving the at least one non-combustible bar, preferably two non-combustible bars. 
     
     
         5 . The fire-rated ventilation duct according to  claim 1 , wherein the stiffening member comprises an attachment section via which the stiffening member is attached to the outside of the ventilation duct and wherein the attachment section of the at least one stiffening member extends beyond the longitudinal extent of the opening. 
     
     
         6 . The fire-rated ventilation duct according to  claim 1 , wherein the at least one stiffening member is contained within the opening such that the at least one stiffening member does not extend beyond the longitudinal extent of the opening. 
     
     
         7 . The fire-rated ventilation duct according to  claim 1 , wherein the ventilation duct comprises a metal sheet to which the stiffening member is attached, and where the stiffness of the metal sheet is lower than the stiffness of the stiffening member in a direction transverse to the longitudinal direction. 
     
     
         8 . The fire-rated ventilation duct according to  claim 1 , wherein the stiffening member extends transversely to the longitudinal extension of the ventilation duct. 
     
     
         9 . The fire-rated ventilation duct according to  claim 1 , wherein the fire protection material, such as mineral wool, preferably stone wool, is also arranged on the outside of the stiffening member. 
     
     
         10 . A method of manufacturing and/or installing a ventilation duct in a fire-rated ventilation duct structure penetration arrangement, said method comprising the steps of:
 providing a ventilation duct section;   mounting at least one elongated stiffening member located on the outside of the ventilation duct section and attached to the ventilation duct section;   positioning the ventilation duct section with stiffening member through an opening extending longitudinally through a building structure, such that the stiffening member is arranged substantially within the opening of the building structure;   covering the ventilation duct section and the stiffening member with a fire protection material; and   sealing a gap between the outer surface of the fire protection material and the opening in the building structure.   
     
     
         11 . The method according to  claim 10 , wherein the method further comprises providing a fire-rated ventilation duct structure penetration arrangement comprising:
 a ventilation duct; and   a building structure comprising an opening extending in a longitudinal direction through the building structure, through which the ventilation duct extends;   wherein the ventilation duct is covered on an outside by a fire protection material, and the ventilation duct includes at least one elongated stiffening member attached to the outside of the ventilation duct; and   wherein the stiffening member is arranged substantially within the opening of the building structure.   
     
     
         12 . The method according to  claim 10 , wherein the method comprises sealing a gap between the outer surface of the fire protection material and an opening in a building structure, preferably with an intumescent material which is capable of swelling when exposed to heat. 
     
     
         13 . The method according to  claim 10 , wherein the method comprises mounting a transverse section on the ventilation duct, where the transverse section extends along a surface of the building structure. 
     
     
         14 . The method according to  claim 13 , wherein the method comprises mounting the transverse section such that the distance from the surface of the building structure to the surface of the fire protection material of the transverse section of the ventilation duct is smaller than the width of the stiffening member.