Patent ID: 6910253
Filing Date: 2005-06-28
Classification: E04F,F16L,F24F,Y10T

Abstract:
1. A method of construction of an air duct made with rigid insulating material comprising a sandwich made of air cells contained between a first external film and a second internal film, said air duct comprising a wall placed around a major axis parallel to fluid flow direction, said wall comprising a longitudinal union of a first flat end and a second flat end, said air duct comprising opened upstream and downstream ends, said method of construction comprising the following steps of: cutting said sandwich insulting material demarcating a perimeter of predefined dimension; sealing said perimeter of said sandwich to prevent liquid or gaseous fluid exchanges between the interior of said insulting material and the exterior, said step of sealing comprising a step of crushing said first flat end and said second flat end; folding said sandwich around said major axis according to a desired cross-sectional form; assembling said first flat end and said second flat end with means of adhesion, to compplete said cross-sectional form; and installing a rigid adaptor fitting into said downstream end.