1986-02-04
1988-02-16
Joyce, Harold
55355, F24F 710
Patent
active
047247495
ABSTRACT:
A system for providing a hermetically sealed clean room environment (34) from which air enters through a filter (20, 20a) includes a magnetically permissive ceiling grid (22, 26, 54), a filter panel (20, 20a) removably mountable in the grid (22, 26, 54) and a magnetic sealing and mounting arrangement (38, 40, 42, 44, 52) associated with the filter panel (20, 20a) for effectuating an airtight/particle-tight hermetic seal. A permanent magnet (42, 52) extends circumferentially around the periphery of the filter panel (20, 20a) and is bonded thereto, with the magnet (42) being embedded in a gasket (38) in one instance and comprising a magnet blade (52) in another instance. In either instance, a magnetically flowable fluid is disposed between the magnet (42, 52) and the ceiling grid (22, 54) so that when the panel (20, 20a) is placed into the steel ceiling grid (22, 54), a high reluctance path is set up in the air space between the magnet (42, 52) and the steel grid (22, 54) and the magnetic lines of flux (50, 60)travel through the fluid (44) to the ceiling grid (22, 54) as a return path. The fluid (44) aligns itself with these magnetic lines of flux (50, 60) in an attempt to reduce the magnetic reluctance of the circuit and in so doing fills all the voids (45) between the filter panel and the grid mounting interface (38-22, 52-54). The resulting hermetic seal permits the plenum (24) above the dropped ceiling (26) to be positively pressurized by an air blower (28) to provide the clean room environment (34).
REFERENCES:
patent: 3986850 (1976-10-01), Wilcox
Donaldson & Company, Inc.
Joyce Harold
LandOfFree
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