초록

An air conveying duct has a foam core sealed on the inside and reinforced on the outside. The duct absorbs noise and neither introduces impurities into the air nor collects impurities from the air.

대표청구항 ▼

[ What is claimed is:] [1.] An air conveying duct comprising a wall which is formed into a closed profile extending from a first end to a second end in order to convey air therethrough,the wall having an intermediate layer of noise attenuating foam with inner and outer surfaces, an outer layer of ma

[ What is claimed is:] [1.] An air conveying duct comprising a wall which is formed into a closed profile extending from a first end to a second end in order to convey air therethrough,the wall having an intermediate layer of noise attenuating foam with inner and outer surfaces, an outer layer of material disposed on the outer surface of and reinforcing the foam, and an inner layer of material secured to the inner surface of the foam and sealing off the foam from the air but allowing noise to be absorbed by the foam, wherein the material of the inner layer and the material of the outer layer are dissimilar, and the outer layer of material includes an overlapping portion.