18-28-507.11 Grease filters.
   Type I hoods shall be equipped with listed grease filters designed for the specific purpose. Grease- collecting equipment shall be provided with access for cleaning. The lowest edge of a grease filter located above the cooking surface shall be not less than the height specified in Table 18-28-507.11.
Table 18-28-507.11
Minimum Distance Between the Lowest Edge of a Grease Filter and the Cooking Surface or the Heating Surface
 
Type of Cooking Appliance
Height Above Cooking Surface (Feet)
Without expose flame
0.5
Exposed flame and burners
2
Exposed charcoal and charbroil type
3.5
 
For SI: 1 foot = 304.8 mm.