Ventilation – Chimney or stack – Chimneytop or stacktop structure
Patent
1992-10-27
1993-12-07
Joyce, Harold
Ventilation
Chimney or stack
Chimneytop or stacktop structure
454 32, F23L 1706
Patent
active
052678946
ABSTRACT:
A vent termination assembly for a vertical pipe, stack or tube including a hinged flapper to normally close the end of said vent termination assembly and at least one downwardly sloping normally open to the atmosphere side pipe bevelled to discharge generally upward. The flapper contains energy adsorbing side beams to reduce velocity of the flapper during opening.
REFERENCES:
patent: 233584 (1880-10-01), Walker
patent: 261398 (1882-07-01), Smith
patent: 295687 (1884-03-01), Stasch
patent: 912076 (1909-02-01), Cochran
patent: 2774294 (1956-12-01), Kahle
patent: 4671171 (1987-06-01), Brill
patent: 4742766 (1988-05-01), Davison et al.
Air Products and Chemicals Inc.
Joyce Harold
Marsh William F.
Simmons James C.
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