Stainless steel foil laminated plastic hvac duct and method of making same

Abstract

A flame-resistant, insulated, plastic HVAC duct including a channel configured for conveying forced air and a duct wall forming the channel, the duct wall including a plastic layer disposed between a thermally insulating layer and a metal foil layer. The metal foil layer is arranged to form an outer surface of the duct wall, and the thermally insulating layer is arranged to form an inner surface of the duct wall. A second metal foil layer may be disposed between the thermally insulating layer and the plastic layer.

1 - 16 . (canceled) 
     
     
         17 . A method of making an HVAC duct comprising,
 laminating a first steel foil sheet to a first plastic sheet to form a first wall member, and   arranging the first wall member to form a first tube,   wherein the first steel foil sheet forms an outer surface of the first tube.   
     
     
         18 . The method of  claim 17  including laminating a metal foil sheet to the first plastic sheet to form the first wall member, the metal foil sheet being selected from a group consisting of a second steel foil sheet, an aluminum foil sheet, an alloy foil sheet and a tin foil sheet. 
     
     
         19 . The method of  claim 17  including coupling a thermal insulator to the first wall member. 
     
     
         20 . The method of  claim 17  including laminating a second steel foil sheet to a second plastic sheet to form a second wall member and arranging the second wall member to form a second tube that is concentrically arranged within the first tube, wherein the second steel foil sheet forms an inner surface of the second tube.