In which direction shall ducts slope toward?

Ducts in a mechanical system should slope towards drainage points. This is important for ensuring proper drainage and preventing the accumulation of moisture, which can lead to mold growth or damage to the ductwork and associated systems. When ducts are properly sloped towards drainage points, any condensation or liquid that collects within the ducts can flow out efficiently, maintaining the integrity and performance of the system.

While grease traps and grease reservoirs are relevant in the context of managing grease in kitchen exhaust systems, they are not the final points for drainage from the ducts themselves. Ventilation openings are designed for air circulation and do not serve the function of removing moisture or liquid accumulation. Thus, the proper approach is to ensure that ducts are sloped toward designated drainage points for effective moisture management.