Double wall fire proof duct

Details Double wall fire proof duct Double wall fire proof duct

B - Operations, Transporting

32

B

B32B 1/08 (2006.01) B29C 53/60 (2006.01) B29C 53/80 (2006.01) B29C 63/06 (2006.01) B32B 5/28 (2006.01) B32B 27/04 (2006.01) F16L 9/16 (2006.01) F16L 57/04 (2006.01) F16L 58/10 (2006.01)

Patent

CA 2042986

A composite plastic duct structure comprised of an outer layer of fabric material impregnated with a fire- resistant resin material and an inner liner layer of chemically corrosion resistant resin material impregnated with a fabric material. The invention includes a method wherein multiple wrappings of resin impregnated material are wound on a mandrel to form the inner and outer layers.

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