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The requirement for installing grease filters in commercial kitchens specifies that the filters must be installed at an angle of not less than 30 degrees from the horizontal. This specific angle is crucial because it allows for effective trapping of grease particles while ensuring that the airflow remains efficient. When grease filters are set at this angle, they can effectively channel the grease downward toward the grease collection system, minimizing the risk of grease buildup in the ductwork, which can lead to fire hazards or restricted airflow.

Although other angles can be used, such as 45 degrees, the key factor here is that a minimum angle of 30 degrees is mandated to enhance performance while adhering to safety standards. This design consideration is critical in maintaining kitchen air quality and ensuring compliance with fire safety regulations, as well as facilitating easier cleaning and maintenance of the grease filters.