Totally fusible tunnel ventilation damper system

Details Totally fusible tunnel ventilation damper system Totally fusible tunnel ventilation damper system

1989-02-02

1990-02-06

Joyce, Harold

98 1, F24F 1104

Patent

active

048980889

ABSTRACT:
A totally fusible tunnel ventilation damper system which comprises an enlarged ventilation opening partially covered by a sheet of fusible material. The sheet of fusible material is supported by a series of bars traversing the ventilation opening and is secured to the support bars by fire retardant fasteners.

REFERENCES:
patent: 609278 (1988-08-01), Kane
patent: 1380207 (1921-05-01), Hogstrom
patent: 2416284 (1947-02-01), Brown
patent: 3731442 (1973-05-01), Kiyoshi
patent: 3818816 (1974-06-01), Petit
patent: 3918226 (1975-11-01), Naidus

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