Which direction should ductwork slopes be oriented?

Ductwork slopes should be oriented downward towards the vents. This orientation is essential for effective drainage of condensation and moisture that can accumulate within the ducts during operation. When ductwork is installed with a downward slope, it allows any water that forms as a result of temperature changes or humidity to flow away from the HVAC unit and towards the vents, preventing pooling and potential damage or inefficiencies in the system.

A downward slope helps maintain proper airflow and efficiency by ensuring that all moisture is directed towards the drainage system rather than remaining stagnant in the ductwork, which could lead to mold growth or other issues. This aspect is particularly important in humid environments where condensation is more likely to occur.

In contrast, ducts that are sloped upward toward the HVAC unit would likely encourage moisture to accumulate, while horizontal ducts may not effectively manage condensation. Diagonal slopes can create additional complications and does not provide the consistent drainage required for optimal performance.