Fire resistant ventilation duct and a method of manufacturing and installing such ventilation duct
US12247689B2 · kind B2 · utility
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31Claims
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Key dates
| Filing date | Dec 11, 2020 |
| Grant date | Mar 11, 2025 |
| Priority date | — |
| Expiry date | Nov 19, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2221/30
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ventilation duct for a fire rated ventilation duct wall penetration has one or more metal sheets forming said duct, wherein said metal sheet duct is covered on the 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. The stiffening members each comprises a metal profile and at least one non-combustible bar of inorganic material. The metal profile is fixed to the metal sheet of the duct and retains the non-combustible bar by at least partly encircling the bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.