Patent ID: 9371941
Filing Date: 2016-06-21
CPC Classification: F16L,F24F

Claim Text:
1. An air circulation duct section, comprising: an inner duct air passageway formed with a first insulation material of foam insulation material disposed between metal foil sheets, said passageway having a top wall, a bottom wall and two opposed sidewalls; at least a first layer of solid insulation with insulation material disposed between metal foil sheets, said first layer having a top surface and an opposite surface, with its opposite surface joined to the top wall of the inner duct air passageway; a first jacket joined to the top surface of the first layer of solid insulation, said first jacket having at least one angled flange edge along its length; at least a second layer of solid insulation with insulation material disposed between metal foil sheets, said second layer having a top surface and an opposite surface, with its opposite surface joined to the bottom wall, a second jacket joined to the top surface of the second layer of solid insulation; at least a third layer of solid insulation with insulation material disposed between metal foil sheets, said third layer having a top surface and an opposite surface, with its opposite surface joined to one sidewall, a third jacket joined to the top surface of the third layer of solid insulation, said third jacket having at least one angled flange along its length; at least a fourth layer of solid insulation with insulation material disposed between metal foil sheets, said fourth layer having a top surface and an opposite surface, with its opposite surface joined to the other sidewall, a forth jacket joined to the top surface of the fourth layer of solid insulation, said fourth jacket having at least one angled flange along its length; wherein the angled flanges of the jackets overlap edges of adjacent jackets for attachment thereto, and wherein said jackets, insulation layers and inner duct air passageway together form the air circulation duct section.