What is the minimum required slope for grease hood exhaust ducts?

The minimum required slope for grease hood exhaust ducts is 1/4 inch in 12 units. This specification is important because it ensures proper drainage of condensation and grease that may accumulate within the ductwork during operation. A slope of 1/4 inch per foot allows for effective drainage, helping to prevent potential clogs and maintain the efficiency of the exhaust system. Additionally, proper sloping minimizes the risk of grease buildup, which can pose a fire hazard as it can ignite if allowed to accumulate excessively. Meeting this requirement is crucial for compliance with safety regulations and codes governing kitchen ventilation systems.