Ventilation – Means combined with door
Patent
1991-07-18
1993-03-16
Joyce, Harold
Ventilation
Means combined with door
70445, 109 1V, F24F 700
Patent
active
051940396
ABSTRACT:
A system for introducing fresh air to a locked vault which is integral to the door of the vault. A fan provides motive force to the air which flows principally through passages in, or created with, existing components in the door. A food/water passage may be furnished by providing the door wheel spindle as a hollow, rather than a solid, tube.
REFERENCES:
patent: 1426424 (1922-08-01), Taylor
patent: 1539292 (1925-05-01), Bezdecheck
patent: 1590007 (1926-06-01), West
patent: 1666673 (1928-04-01), Williams
patent: 1873452 (1932-08-01), Meilink
Crozier John H.
Joyce Harold
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