smoke extraction ducts
Firespray® is a fibrous spray-on mixture used for fire protection of smoke extraction ducts.
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Techniques for implementing Firespray® for the fire protection of circular sheet metal smoke extraction ducts, horizontal and vertical
Fire protection can be applied to horizontal and vertical circular sheet metal smoke extraction ducts with a diameter of between 0 and 1000 mm, and with a maximum section length of 1500 mm
The thickness of the sheet metal varies with duct diameter.
The spacing between the support systems must be no more than 900 mm at the most.
Assembly involves ducts comprising sections with a maximum length of 1500 mm. These elements are connected to each other by means of circular galvanised steel flanges, fixed to the duct by means of clinching and self-drilling screws.
Galvanised steel collars are fitted at the junctions between sections, ensuring the assembly of the flanges to the pipe.
631 to 1000 mm: a half-collar will be positioned at the lower half perimeter of the duct, supported on each side by M10 threaded rods.
Also possible in 0 to 630 mm: two half-collars fixed together and supported by an M10 threaded rod.
Firespray® fire protection coating is applied to the duct body in one or more layers, i.e. 56 mm in EI 60 min, and 80 mm in EI 120 min.
Protection of support systems for horizontal and vertical circular sheet metal smoke extraction ducts
For fire protection of the support system, the threaded rods are covered with a mesh and then sprayed with a layer of Firespray® with the same thickness as that of the duct, or by means of a 30mm-thick rock wool shell followed by a mesh and a layer of Firespray® (shell + sprayed product of the same thickness as that used on the duct).
Techniques for implementing Firespray® for the fire protection of rectangular sheet metal smoke extraction ducts, horizontal and vertical
Fire protection coatings can also be applied to horizontal and vertical rectangular sheet metal smoke extraction ducts with sections of between 0x0 and 1250x1000 mm, and with a maximum section length of 1000 mm. The thickness of the sheet metal varies with duct diameter.
The spacing between the support systems must be no more than 975 mm at the most.
Assembly involves ducts comprising sections with a maximum length of 1000 mm. These elements are interconnected using galvanised steel profiles, which are welded on the duct and fixed together with M10 bolts.
The sealing between the different sections is ensured by a self-adhesive seal, as well as by frame collars positioned on the duct profiles.
Internal reinforcements consisting of steel stanchions, 17/21 mm (int. Ø, ext. Ø) positioned at a maximum distance of 500mm from each other (sketch 3) for duct heights > 500mm.
External reinforcements in the form of "U" shaped frames are installed on the external section of the sections, placed at a maximum distance of 500 mm from each other (sketch 3).
The support system for horizontal ducts (sketch 1, 2) for sections of - 0x0mm to 1250x1000 mm: the duct is supported by suspension cradles positioned at a maximum centre distance of 975 mm. Consisting of U-shaped cross members and two M10 threaded rod hangers.
Firespray® fire protection coating is applied to the duct body in one or more layers, i.e. 57 mm in EI 60 min, and 74 mm in EI 120 min.
Techniques for implementing Firespray® for the fire protection of circular sheet metal smoke extraction ducts, horizontal and vertical
For fire protection of the support system, like the U-shaped frames, the cross member is incorporated into the fire protection of the duct body. The threaded rods are covered with a mesh and then sprayed with a layer of Firespray® with the same thickness as that of the duct, or by means of a 30mm-thick rock wool shell followed by a mesh and a layer of Firespray® (shell + sprayed product of the same thickness as that used on the duct).