Question

The length of the vent stack is taken from

Answer 1

The length of a vent stack is typically measured from where it exits the roof to the lowest building drain branch. Exact measurement starting points can vary with local regulations and system design.

Step-by-step explanation:

The length of the vent stack is typically measured from the point where it penetrates the roof to the lowest branch of the building drain. The vent stack serves the critical function of allowing air to enter the plumbing system, which helps maintain proper atmospheric pressure in the system and allows wastewater and sewage gases to escape. The exact starting point for measuring the length of the vent stack may differ based on building codes and regulations, as well as the specific design and layout of the plumbing system within a building.