| 摘要 |
An adjustably directed and rollably movable clean air assembly (70), which directs clean air in a selectable direction (34) through a designated volume where an activity is being undertaken. Air (38) is drawn into the lower hollow housing (50) by an air moving assembly located therein, through a pre-filter, flowing upwardly through the hollow tower housing (56) and continuing through an adjustable height telescoping structural tube (58). On exiting tube (58) the pre-filtered air enters self-sealing bellows (60) and then on to the filter hood assembly (66). The air passes through a HEPA filter housed in the filter hood assembly (66) out to the designated area.
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