| 摘要 |
PROBLEM TO BE SOLVED: To excellently drain water by optimizing a pipe diameter and confluence in respective drain pipes and also ventilation. SOLUTION: In a drain pipe 3, a pipe diameter of a main pipe 7 on the downstream side of a confluent part for merging branch pipes 6, 6 from kitchen and sanitary space equipment is increased more than a pipe diameter of the merged branch pipes 6, 6. A pipe diameter of a waste water branch pipe 11 from a toilet bowl 4 is increased more than a pipe diameter of the miscellaneous branch pipes 6, 6 from a washer 2 and a washstand 1.
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