US 12,247,689 B2
Fire resistant ventilation duct and a method of manufacturing and installing such ventilation duct
Kurt Munk Pedersen, Hedehusene (DK); Jürg Dieter Stefan Rödenberger, Hedehusene (DK); and Markus Thoma, Hedehusene (DK)
Assigned to ROCKWOOL A/S, Hedehusene (DK)
Appl. No. 17/783,751
Filed by ROCKWOOL A/S, Hedehusene (DK)
PCT Filed Dec. 11, 2020, PCT No. PCT/EP2020/085771
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/116411, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 19215568 (EP), filed on Dec. 12, 2019.
Prior Publication US 2023/0003333 A1, Jan. 5, 2023
Int. Cl. F16L 57/04 (2006.01); F16L 5/04 (2006.01); F16L 9/00 (2006.01); F16L 9/17 (2006.01); F16L 59/04 (2006.01); F16L 59/12 (2006.01); F16L 59/14 (2006.01); F24F 11/33 (2018.01); F24F 13/02 (2006.01)
CPC F16L 57/04 (2013.01) [F16L 5/04 (2013.01); F16L 9/003 (2013.01); F16L 9/17 (2013.01); F16L 59/04 (2013.01); F16L 59/121 (2013.01); F16L 59/143 (2013.01); F16L 59/145 (2013.01); F24F 11/33 (2018.01); F24F 13/0245 (2013.01); F24F 13/0263 (2013.01); F24F 2221/30 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A ventilation duct for a fire rated ventilation duct wall penetration, said ventilation duct comprising:
one or more metal sheets forming said duct, wherein said metal sheet duct is covered on an outside by a heat insulating material, and said duct includes elongated stiffening members located on the outside of the duct and attached to said metal sheets;
wherein the stiffening members each comprise a metal profile and at least one non-combustible bar of inorganic material; and
wherein the metal profile is fixed to the metal sheet of the duct and retains the at least one non-combustible bar by at least partly encircling the bar.