Which statement best describes the Clearwater vent requirement?

• A. The vent for the clearwater drain system may not be connected to a vent system serving a sanitary drain system or chemical waste system
• B. The Clearwater vent must connect to the building's sanitary vent system
• C. The Clearwater vent must be installed on the roof
• D. The Clearwater vent may be connected to any vent system

Answer: (A)

Venting for a clearwater drain must be kept separate from the vent networks that handle sanitary waste and chemical waste. If the clearwater vent were connected to a vent system serving sanitary or chemical drains, gases, odors, or even backflow from those systems could travel into the clearwater drainage path, creating odors or potential contamination and interfering with the sanitary vent’s proper function. Because of that, the vent for the clearwater drain should not be tied into a vent system that serves sanitary drains or chemical waste.

Connecting it to the building’s sanitary vent would merge two different drainage streams and risk cross-connection and air/gas migration. Requiring the vent to be on the roof isn’t the key point here, and saying it can connect to any vent system is not true due to the potential cross-connection hazards.