What is a key requirement for cleanouts in grease ducts?

The requirement for cleanouts in grease ducts to be placed where ducts change direction is founded on the need for effective maintenance and cleaning. Grease ducts are typically used in commercial kitchens and are prone to the accumulation of grease, which can lead to fire hazards if not properly maintained.

When a duct changes direction, it creates a point where grease can build up due to the change in airflow dynamics. Placing cleanouts at these points allows for easier access and more effective removal of grease deposits, ensuring that the system operates safely and efficiently. This is essential for keeping the duct system compliant with safety standards and preventing potential fire hazards.

In contrast, while cleanouts every 6 feet, at high points, or visible from the ground can be considerations for other duct systems, they do not address the specific need for maintenance at directional changes within grease ducts. This highlights the unique requirements for grease duct systems compared to standard HVAC duct systems.