A duplex is treated as single family, as is a townhome or townhouse. Because the duct leakage requirements for these dwelling units are different from multi-family, they must show compliance based upon each dwelling unit and a model for each unit must be developed, with separate reports.
However, in the case of a townhome that has more than 3 stories, this will fall under the Highrise Residential Standards and a Nonresidential calculation must be run. In this case a single model can be developed for all of the townhomes.
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