What is the maximum height for a sink drain from the floor to the fixture outlet?

The maximum height for a sink drain from the floor to the fixture outlet is determined by plumbing codes, which aim to ensure proper drainage and prevent issues such as backflow or improper sealing in the plumbing system. The height of 30 inches is commonly accepted, as it provides a balance between accessibility for maintenance and functionality within standard residential settings. This height allows for effective drainage, ensuring that the waste flows properly and that the plumbing system operates efficiently without causing potential clogs or drainage issues.

Higher fixture outlets could create a situation where gravity cannot assist in moving the water and waste down the drain effectively, increasing the likelihood of slow drainage or other complications. Keeping the outlet at 30 inches helps maintain good plumbing practices and adheres to the majority of building codes that dictate drain heights in residential plumbing installations.