What is one key feature that all exhaust systems in commercial cooking operations should have?

The key feature that all exhaust systems in commercial cooking operations should have is accessibility for inspection and cleaning. This is essential for maintaining the safety and efficiency of the cooking environment. Over time, grease and other combustible residues can accumulate in exhaust systems, presenting a serious fire hazard. Regular inspections and cleanings are necessary to reduce the risk of fire and ensure that the ventilation system is functioning properly. Accessibility allows for thorough cleaning, which is vital in preventing fire-related incidents and ensuring compliance with safety standards set forth in NFPA 96.

While the other options might seem beneficial for various operational aspects, they do not address the critical need for maintaining the health and safety of the cooking environment in the same way that accessibility does. A system that cannot be easily accessed for inspection and cleaning could lead to dangerous conditions that compromise the safety of the kitchen and its operations.