Double-walled structure in a ventilation duct system

Details Double-walled structure in a ventilation duct system Double-walled structure in a ventilation duct system

1998-07-10

2000-05-16

Kashnikow, Andres

Pipes and tubular conduits

Flexible

Spirally wound material

138122, 138143, F16L 1100, F16L 914

Patent

active

060622709

ABSTRACT:
A double-walled structure in a ventilation duct system has an inner tube and an outer tube and, arranged therebetween, a sound-absorbing material. The inner tube is a helically-wound lock-seam tube formed from a sheet metal strip having parallel longitudinal areas of expanded metal.

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