Patent ID: 9611962
Date: 2017-04-04
CPC Classifications: F16L,F24F

Claim:
1. A self-supporting air duct, comprising: panels coupled by tongue-and-groove coupling along a longitudinal joint line between two panels, wherein the panels are made up from a core panel of insulating material supplemented with both an outer coating layer and an inner coating layer, and each panel has a respective coupling profile with a canted edge, the panels being juxtaposed with a joint line parallel to the canted edge with the respective canted edges of the panels facing each other, and wherein the canted edges have an oblique surface cut from a horizontal surface of the core, wherein the coating layer, which determines the inner face of the duct, extends beyond the edge of the panel, being fixed to at least a portion of the oblique cut surface that defines the coupling profile, wherein the panels are planar having two horizontal parallel surfaces.