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US 7,753,977 B2Granted
Air filtration system having a removable diffuser
AssigneeFiltration Group Incorporated
InventorsEdward F. Lyons, Wenli Wang, Philip J. Winters
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Abstract
An air filtration system includes a support structure, an enclosure coupled to the support structure and including an air outlet, a filter and a fan operatively coupled to the enclosure, and a diffusion screen configured to cover the air outlet. The diffusion screen includes a screen frame configured to be removably attachable to the enclosure with at least one releasable fastener, and at least a diffusion layer substantially spanning the screen frame to cover the air outlet to provide unidirectional or laminar air flow from the air outlet.
Claims4
An air filtration system comprising:
- (a) a support structure;
- (b) an enclosure coupled to the support structure and including an air outlet;
- (c) an air filter housed in the enclosure;
- (d) a fan operatively coupled to the enclosure;
- (e) a screen frame;
- and
- (f) a unidirectional flow screen spanning the screen frame, the unidirectional flow screen having a downstream side defined along a single plane, the unidirectional flow screen covering the air outlet to result in unidirectional filtered air flow;
- the unidirectional flow screen:
- (i) being spaced from the air filter;
- (ii) consisting of a single layer of polymeric fabric constructed and arranged to provide unidirectional filtered air flow from the air outlet such that filtered air flows in a single direction with generally parallel air streamlines;
- (iii) having a weave pattern with pore sizes of 50-200 micrometers;
- and
- (iv) creating only unidirectional parallel air streamlines across the flow screen, to shield a work area from unfiltered air surrounding the work area to result in filtered air that travels further to the work area with lower levels of cross-contamination from particulates present in the surrounding unfiltered air than filtered air from an air filtration system without a unidirectional flow screen.
10 more elements
Dependencies are inferred from the claim text.