Double-walled structure in a ventilation duct system
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United States of America Patent
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May 16, 2000
Issued Date -
N/A
app pub date -
Jul 10, 1998
filing date -
Jan 27, 1997
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Expired
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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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