VENTILATION DUCT
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United States of America Patent
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Issued Date -
Jan 4, 2018
app pub date -
Jun 29, 2017
filing date -
Jun 30, 2016
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Abstract
A ventilation duct 10, the duct 10 comprising a substantially rigid, elongate tube section 12 moulded from plastics material and having a tube wall 14 comprising a plurality of layers. At least one of the layers comprises an intumescent material which acts as a fire retardant in the event of exposure to extreme heat.
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