Air Flow - Which is the operational difference between LAF (vertical and horizontal) and RLAF?


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Dear all,
please help, which is the operational difference? I have seen a lot of diagrams and the flow air between them are the same: extract air from the environment then filter and then is inject in work zone, then extract and a percent of air recirculate and the other is eliminate by filter to the environment.

very thankfuly for your comments.

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