What kind of protective coating is required for external ductwork?

The requirement for a weather protective coating on external ductwork is grounded in the necessity for durability and performance in a variety of environmental conditions. Such coatings are designed to safeguard the ductwork from moisture, UV rays, and other weather-related elements that can lead to corrosion and degradation over time. This is especially important for ductwork that is exposed to the elements, as it must maintain its structural integrity to function effectively in ventilation processes.

Having a weather protective coating ensures that the ductwork can withstand external influences, ultimately helping to extend the service life of the system and maintain safety standards. This aligns with the NFPA 96 standard's emphasis on ensuring that commercial cooking operations are conducted safely and efficiently while minimizing the risk of fire hazards, which can be exacerbated by compromised duct systems.