Much has been written about controlling the minimum-outside-air quantity in variable-air-volume (VAV) air-handling systems. Instead of debating the merits of various control methods, this article will discuss how to apply the mixed-air-plenum pressure method and why it works. BACKGROUND Although most buildings require outside air to make up exhausts and meet ventilation needs, other buildings require a constant minimum quantity of outside air. In constant-volume systems, the minimum ...
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