It is illegal to operate the exhaust system without the proper grease filters installed while cooking equipment is in operation.
Grease filters are the first line of defense since they capture the grease-laden air exhausted from the cooking equipment into the environment. Proper maintenance of the filters is essential to the safety and effective operation of the exhaust system. There are several approved filtration types utilized in exhaust systems, the most common is the baffle-type grease filter. Other types include the dry-cartridge filters, filters found in self-washed hood systems and a recent filtration concept utilizing Ultra Violets (UV).
Baffle-Type Filters “are typically constructed of galvanized steel (most common), stainless steel (most expensive), and aluminum (the lightest).
Baffle filters must be installed at an angle of no less than 45* with the baffles on a vertical position and the drain holes towards the bottom. This positioning allows the captured grease particles to slide downward through the filter’s drain hole and into the trough and cup, which must be frequently cleaned.”