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A wind tunnel dispersion modeling study was conducted to investigate exhaust contamination of hidden versus visible air intakes. A “hidden” intake is typically on a building sidewall or on the sidewall of a roof obstruction opposite the exhaust source. A “visible” intake is at roof level... show more A wind tunnel dispersion modeling study was conducted
to investigate exhaust contamination of hidden versus visible
air intakes. A “hidden” intake is typically on a building sidewall
or on the sidewall of a roof obstruction opposite the
exhaust source. A “visible” intake is at roof level or on top of
an obstruction, directly above the hidden intake. Overall, the
study has shown what designers suspected: placing air intakes
on building sidewalls is beneficial when the stacks are on the
roof. Significant concentration reductions were found when air
intakes are placed right below the building roof edge on the
building sidewall. The farther down the building sidewall the
air intake is placed, the larger the reduction. However, the largest
relative reduction between a visible and hidden intake is
achieved by just moving the intake a few feet from the edge of
the building roof to a point just around the corner on the building
sidewall.
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