A 4` soil stack in a building has a cleanout located at its base, the building drain runs from the base of the stack directly into the building sewer. If the length of the building sewer does not exceed ___, an additional cleanout is not required.

A 4` soil stack in a building has a cleanout located at its base, the building drain runs from the base of the stack directly into the building sewer. If the length of the building sewer does not exceed ___, an additional cleanout is not required.