BPI Home Energy Professional (HEP) Quality Control Inspector (QCI)Training Practice Exam

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What is the minimum required rise for ventilation exhaust duct work?

1/8 in. per foot

1/4 in. per foot

The minimum required rise for ventilation exhaust duct work is crucial for ensuring that condensate can drain properly and to maintain appropriate airflow throughout the system. A rise of 1/4 inch per foot enables sufficient drainage of any moisture that may form inside the duct, which helps prevent water pooling and reduces the likelihood of mold growth or other moisture-related issues. This angle is considered the standard in many building codes and guidelines because it provides a balance between effective drainage and practicality in duct installation.

When the rise is too steep, it could lead to increased friction losses and possible airflow issues, while a rise that is insufficient may not allow for adequate drainage, leading to the same moisture-related problems. Therefore, a rise of 1/4 inch per foot is established as the minimum requirement for effective exhaust duct systems.

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1/2 in. per foot

1 in. per foot

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