What should be determined from Table 2-2 when calculating the venting for water heating appliances?

When calculating the venting for water heating appliances, the determination of the vent connector rise and height is essential. This information is critical because the venting system needs to ensure proper draft to expel combustion gases safely and effectively. The rise and height of the vent connector directly influence the efficiency of the venting system, as they need to be configured correctly to avoid issues such as backdrafting or insufficient venting.

Moreover, knowing the appropriate dimensions for the vent connector helps to maintain a proper flow of exhaust gases, which is vital for the safe operation of the appliance. Adequate rise ensures that the gases can escape without condensing in the vent, which can cause corrosion or blockages. Therefore, focusing on the vent connector rise and height enables a technician to design a venting system that adheres to safety codes and performance standards, ensuring that the water heating appliance operates as intended.