| Abstract | In 1964, the National House Builders Association constructed an experimental house, known as the Mark IV at the Rockcliffe air station in Ottawa for the purpose of analyzing new materials and systems unrestricted by existing codes and standards incorporated in an occupied house. One of the experimental features in this house was the plumbing system. Three separate vent stacks of different sizes were built into the system. These vent stacks, each of which could be operated independently, were included in order to investigate the effect of vent size on the fixture trap seals. |
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