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Where should the trap for a clothes washer standpipe not be installed?

  1. 18 inches above the floor

  2. In a partition

  3. 6 inches above the floor

  4. Below the floor

The correct answer is: Below the floor

The trap for a clothes washer standpipe should not be installed below the floor because this placement could potentially lead to issues with proper drainage and venting. When a trap is situated below the floor level, it becomes difficult to maintain the necessary water seal that prevents sewer gases from entering the home. Additionally, a trap installed below grade may not effectively handle the discharge from the washer, as gravity drainage is hindered and can lead to backflow or clogs. Installing the trap at appropriate heights, such as 18 inches or 6 inches above the floor, is crucial for ensuring that it functions effectively. This allows for proper drainage, helps maintain the water seal, and ensures that the connections are accessible for future maintenance or inspection. Similarly, installing the trap in a partition is permissible as long as it meets local plumbing codes and maintains the necessary height and clearance for effective operation.