What should the size of a common vent be when used between two vent connectors of different sizes?

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The size of a common vent when used between two vent connectors of different sizes should indeed be calculated as the size of the largest vent connector plus 50% of the smaller connector. This approach ensures that the common vent is adequately sized to handle the total venting capacity needed for both appliances connected to it.

When determining the appropriate size for a common vent, it's essential to account for both the largest and smallest outlets because the larger connector will dictate the baseline flow requirements, while the additional capacity from the smaller connector helps to ensure that the vent system can efficiently handle the combined gases without causing back pressure or insufficient venting.

This sizing method prevents potential issues that could arise from undersized vents, such as inadequate draft or increased risk of backflow, which can lead to safety hazards. By using both sizes in the calculation, the venting system is optimized for performance and safety.

Choosing a size equal to the largest vent connector alone could risk underutilization of the smaller appliance’s venting capabilities. Meanwhile, selecting just the size of the smaller connector ignores the need for adequate venting for the larger appliance. Combining both sizes in the manner described ensures a balanced and effective venting system.

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