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US 2018/0003058 A1Published application
Ventilation duct
AssigneeHiram (Wa) Pty Ltd
InventorSteven Peter DURKIN
Life of this patent
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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.
Claims14
A ventilation duct, the duct comprising:
- a substantially rigid, elongate tube section moulded from plastics material and having a tube wall comprising a plurality of layers, at least one of the layers comprising an intumescent material which acts as a fire retardant in the event of exposure to extreme heat.
A method of manufacturing a ventilation duct, the method comprising the steps of:
- moulding a first layer of plastics material;
- moulding a second layer of plastics material bonded to the first layer, at least one of the first and second layers including an intumescent material;
- and,
- curing the plastics material so as to form a substantially rigid tube section having a multi-layer tube wall, and wherein the intumescent material acts as a fire retardant in the event of exposure to extreme heat.
1 more element
Dependencies are inferred from the claim text.