If more than two 90° elbows are used in a vent connector, by what percentage should the capacity of the connector be reduced for each additional elbow?

When assessing the effect of additional 90° elbows in a vent connector, it's important to consider the impact on airflow and capacity. Each consecutive elbow introduces additional resistance in the venting system, which can significantly affect the movement of gases.

The industry standard specifies that for every additional 90° elbow beyond the first two, the capacity of the connector should be reduced by 10%. This reduction helps account for the increased turbulence and pressure drop that each elbow contributes to the airflow, ensuring that the venting system remains effective and safe.

Understanding this principle is crucial for technicians to ensure compliance with safety standards and maintain the efficiency of venting systems. Thus, a 10% reduction for each additional 90° elbow used in a vent connector is the correct approach to calculate the effective capacity of the system.