Field applied enclosure systems for Type I hoods must be what to meet the required configuration?

For Type I hoods, which are designed for duct systems that handle grease-laden vapors, it's essential that any field-applied enclosure systems are both listed and labeled. This requirement signifies that the enclosure systems have been tested and meet specific safety standards set forth by recognized testing laboratories. Such standards ensure that they can effectively contain any potential hazards associated with grease accumulation, as well as offer proper performance under conditions they will face in an actual kitchen environment.

Having a listed and labeled enclosure means that it has been vetted for compliance with applicable codes and regulations, ensuring that it will function as intended in preventing fires and facilitating adequate ventilation. This level of assurance is crucial for the safety and effectiveness of kitchen exhaust systems, as it provides a benchmark for quality and reliability in commercial cooking operations.