Patent ID: 6230750
Filing Date: 2001-05-15
Classification: E04F,F16L,F24F,Y10T

Abstract:
An air duct comprising:one or more segments, each segment disposed longitudinally relatively to a major axis parallel to an air flow, each segment comprising a wall defining an internal space that permits flow of said air, said wall being uniformly thick and made of a sandwich material comprising air cells contained between a first external film and a second internal film, said second internal film coinciding with the internal space,each said segment comprising an upstream end and a downstream end, said upstream end and said downstream end being opened, each segment comprising means for coupling fitted at one of said ends to join a segment to another segments,wherein said wall forms a parallelepiped with a rectangular section comprising a top, a closed side, a bottom, an opened side, and at least three longitudinal lines for folding of which one demarcating a first limit, between said top and said closed side, another demarcating a second limit between said closed side and said bottom, and a third demarcating a third limit, between said bottom and said opened side, said parallelepiped comprising means for reinforcement orientated along said major axis, touching said top and bottom.