How far apart must cleanouts be located on horizontal sections of commercial grease ducts?

The correct answer indicates that cleanouts must be located a maximum of 20 feet apart on horizontal sections of commercial grease ducts. This requirement is based on the need for effective maintenance and cleaning of the duct system. Grease ducts accumulate deposits that can lead to blockages or fire hazards if not properly maintained. By specifying a distance of 20 feet, the code ensures that cleanouts are accessible and can be utilized effectively at reasonable intervals to facilitate cleaning.

In commercial applications, the grease duct system deals with higher volumes of grease-laden vapors and is more prone to buildup compared to standard ducts. Therefore, ensuring cleanouts are placed at these intervals helps mitigate potential fire risks and maintains the efficiency of the ventilation system. Proper adherence to this requirement is crucial for safety and compliance with code standards in commercial kitchen environments.