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Fire Tests of Rigid Plastic Ventilation Ducts.

Perzak-FJ; Lazzara-CP; Kubala-TA
Proc East Sec the Combustion Institute/nbc Ann Conf on Fire Res 1987 :101-1-101-4
This paper describes a flammability study of plastic ventilation ducts. Six rigid 16-in-diam fiberglass-reinforced-plastic ducts from five manufacturers were examined using laboratory-scale, large- scale, and full-scale fire tests. Ten-foot lengths of the same ducts were also subjected to a large-scale vertical fire test, and 20- to 30-ft lengths were tested in a full-scale in-mine fire test at the Bureau of Mines Lake Lynn Laboratory Mine. The data from the laboratory-scale radiant panel test and oxygen index test indicate that the ducts were fire-resistant. However, five of the six ducts failed the standardized small-scale flammability test (s3ft) and the vertical fire test, and four of the ducts failed the full-scale in- mine tests with flame propagation rates that ranged from 3 to 10 ft/min. The results indicate the need for improved fire-resistant plastic ducts. The good agreement between the s3ft results and the vertical and full-scale tests show that the s3ft provides a good indication of the flammability of fiberglass-reinforced-plastic ducting under realistic fire conditions.
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OP 125-87
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Proc. East. Sec., the Combustion Institute/nbc Ann. Conf. on Fire Res., 1987, PP. 101-1-101-4