Patent ID: 9297550
Filing Date: 2016-03-29
CPC Classification: F16L,F24F,Y10T

Claim Text:
1. An HVAC duct comprising: an outer tube having a fully continuous external perimeter, wherein said outer tube comprises an inner corner; an inner tube capable of conveying forced air, wherein said inner tube extending within said outer tube longitudinally, wherein said inner tube comprises an outer corner, wherein said inner tube comprises a first lateral cross section; a plurality of support elements spanning between said outer tube and said inner tube, wherein each of said outer tube and said inner tube comprises a first end portion and a second end portion, wherein said elements span along said outer tube and said inner tube longitudinally between said first end portions and said second end portions, wherein said elements defining a plurality of channels between said outer tube and said inner tube, wherein each of said channels comprises a second lateral cross section smaller in perimeter than said first lateral cross section, wherein a support element from said support elements spans between said inner corner and said outer corner, wherein said outer tube, said inner tube, and said elements are fully unitary and comprised of same material.