The RWDI Desktop Dilution Calculator is a tool that can be used to approximate the dilution achieved from an exhaust to a fresh-air intake location, and can help in the placement of equipment early in the design process.
The DDC is a conservative screening-level tool intended to make conservative 'first cut' dilution and recirculation zone estimates to aid in the design process. More detailed modeling may be required to achieve an optimum design in minimizing exhaust re-entrainment impacts.
Building designers can compare the dilution estimates furnished by the DDC to dilution criteria to judge acceptability, or use the dilution values to furnish 'concentration at intake' estimates.
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