Patent ID: 6270865
Filing Date: 2001-08-07
Classification: B29K,F16L,F24F,Y10T

Abstract:
A rigid air duct for conducting flowing air, the air duct comprisinga rigid fiber glass board having an interior surface and an exterior surface, the fiber glass board being deformed to cause the interior surface to define a channel for conducting flowing air,a mat facing adhered to the interior surface of the fiber glass board to provide a smooth air-contacting surface lining the channel to maximize laminar flow of air flowing through the channel, the mat facing being a fabric including glass fibers, wherein the fiber glass board includes fiber glass material and uncured portions of a binder material solely in the fiber glass material and the mat facing is adhered to the interior surface of the fiber glass board by subjecting the fiber glass board and the mat facing to a temperature which causes curing of the uncured portions of the binder material solely in the fiber glass material while the mat facing abuts the interior surface of the fiber glass board, andwherein the mat facing has a weight of about 30 pounds per 3000 square feet.