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Standard 1.5-inch residential drains are insufficient for the rapid evacuation phase. A minimum 2-inch to 3-inch dedicated waste line is mandatory to ensure the bath clears within the allotted 12-minute window without backing up. 3. Vapor Barrier and Advanced Ventilation
The timer in her mind ticked. 11 minutes. Hizgi pvt bath gc01-12 Min
If you have more context or the correct spelling/format, I’ll be glad to assist. Standard 1