Final answer:
The statement about vented inlet and outlet tee is not verifiable without specific plumbing standards, but the provided information refers to the significant decrease in flow rate when the radius of a pipe is halved, hence suggesting principles of fluid dynamics.
Step-by-step explanation:
The statement about the minimum length of the downward vertical leg of a vented inlet and outlet tee is not directly related to the given reference information regarding flow rates and changes in the radius of a pipe. Hence, without specific plumbing codes or standards provided, it's challenging to definitively classify the statement as true or false. However, the reference information hints at the principles of fluid dynamics, particularly the continuity equation and Bernoulli's principle, suggesting a focus on the relationship between the cross-sectional area of a pipe and the flow rate. According to the continuity equation, flow rate is proportional to the cross-sectional area of a pipe, and when the radius is halved, the area decreases to a quarter, given that area is proportional to the square of the radius. However, the reference information states that cutting the radius in half decreases the flow rate to one-sixteenth the original flow rate, which implies an even more dramatic decrease than what would be expected from the continuity equation alone. This indicates that another principle, such as laminar flow dynamics or a specific pipe design consideration, could be in play.