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1. US20090165776 - Metal sheet ventilation/smoke duct section and manufacturing method thereof

Office United States of America
Application Number 12227939
Application Date 06.06.2007
Publication Number 20090165776
Publication Date 02.07.2009
Grant Number 08276622
Grant Date 02.10.2012
Publication Kind B2
IPC
F16L 9/14
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
9Rigid pipes
14Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
Applicants Rockwool International A/S
Priority Data 06388042 08.06.2006 EP
Title
(EN) Metal sheet ventilation/smoke duct section and manufacturing method thereof
Abstract
(EN)

The invention relates to a metal sheet (15) ventilation/smoke exhaust duct section (10) for incorporation into a metal sheet ventilation/smoke exhaust duct, said metal sheets (15) being covered on the outside by a heat insulating material (20) and said duct section (10) including elongated stiffening bar members (30) located on the outside of the duct and attached to said metal sheets (15), the invention being characterized in said bar members (30) being located at a distance from said metal sheets (15), said bar members (30) being attached to said metal sheets (15) at discrete locations along the length of the bar members (30).