1989-11-13
1990-07-31
Joyce, Harold
F24F 1100
Patent
active
049442163
ABSTRACT:
A process, for emergency use only, to exhaust smoke and gas from a fire source in the stationary structure of a building with a fan induced exhaust draft at or near the fire source. Actuation of exhaust fans at the roof of the building creates lowered air pressures in a volume of air within ducts leading to the fan inlets. This lowered air pressure in turn causes a draft of air from the building space near the fire source when a single intake to the ducts near the fire source is opened. The air velocity of the draft is sufficient to withdraw smoke and gas from the fire source into the ducts and through the fans to a discharge away from the building. The withdrawal of building air creates a partial vacuum near the fire source which is lower than atmospheric pressure and lower than any other air pressure in the building. Fresh, uncontaminated replacement air enters the building through intakes on the outside perimeter of the building and follows the pressure gradient created toward the fire source.
REFERENCES:
patent: 2564971 (1951-08-01), Harding
patent: 3817161 (1974-06-01), Koplon
patent: 3884133 (1975-05-01), Miller
patent: 3926101 (1975-12-01), Moss
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patent: 4058253 (1977-11-01), Munk et al.
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Uniform Building Code (1988), Extracts: Sect. 1807(a), (d), (e), (f), (g), (h), (i); Sect. 3310; app. 12, 13, 14, 15, 18.
Uniform Mechanical Code (1988), Extracts: Sect. 1102, 1104, 1105, 1106, 1107(a), 2001.
1989 Suppl. to the Uniform Building Code, Extracts: Sect. 1807(f) Revision; Sect. 3310(b) Revision.
Ashrae Symposium Papers Jun. 24-28, 1973, Louisville, Ky., pp. 34-40, "Ventilation Considerations for the Bart Transbay Tube" by Wilmot R. McCutchen.
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