All seams and joints in hoods capturing grease-laden vapors should have what type of weld?

The correct answer highlights the need for continuous external welds at all seams and joints in hoods that capture grease-laden vapors. This requirement is crucial for several reasons. Continuous external welds create a smooth, uninterrupted barrier that can effectively resist the accumulation of grease and other flammable materials. By minimizing the potential for grease build-up, continuous welding helps to reduce the risk of fires, which is a significant concern in commercial cooking operations.

Additionally, continuous external welds also enhance the structural integrity of the hood system. They provide a stronger and more durable connection compared to other types of welds, ensuring that the system remains secure over time. This durability is essential, especially in environments where equipment undergoes frequent cleaning and maintenance.

Overall, adhering to the requirement for continuous external welds not only promotes fire safety but also supports compliance with NFPA 96 standards, reflecting best practices in the design and installation of commercial kitchen ventilation systems.