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US 5,634,847 AGranted
Fire Retardant reinforced plastic duct system
AssigneeShea Technology
InventorLawrence E. Shea
Life of this patent
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Abstract
Fiberglass reinforced plastic fume exhaust systems include duct walls having apertures therein covered with meltable thermoplastic resins mounted thereon which melt and open up the apertures when exposed to high temperatures thereby admitting ambient air therein to reduce the temperature downstream of the systems and reduce the suction pressure at source of the high temperatures.
Claims17
A fire retardant duct system for conducting exhaust vapors and fumes from a building comprising,
- said duct system having a fiberglass reinforced noncollapsible plastic duct and having a front opening, a downstream portion and at least one aperture in the duct wall there between, said aperture covered by meltable components mounted thereon,
- the fiberglass reinforced plastic comprising fire retardant resins having a relatively high autoignition temperature,
- said meltable components comprising thermoplastic resins having melting points lower than said autoignition temperature of the reinforced plastic fire retardant resins,
- whereby said meltable components melt and lay open at least part of said wall aperture when exposed to high temperatures without the plastic duct collapsing.
1 more element
A method of conducting exhaust vapors and fumes from a building by means of retardant duct system comprising
- preparing a fiberglass reinforced plastic duct having a relatively high autoignition temperature and having a noncollapsible duct wall with at least one wall aperture therein,
- covering said wall aperture with a thermoplastic resin having a melting point lower than said autoignition temperature,
- exposing said duct system to high temperatures which melt at least part of the thermoplastic resin and lays open at least part of said wall aperture to surrounding ambient air without the plastic duct collapsing.
Dependencies are inferred from the claim text.