Every restaurant owner should know fire code guidelines for their commercial kitchen, especially when it comes to their exhaust system (range hoods). If these are not properly cleaned and inspected on a regular basis, this can result in a serious fire, damaging your entire kitchen and restaurant. If you do not know your state’s commercial kitchen fire codes, just read below (click on the link at the end of the summary to read about it in more detail).

Exhaust outlets shall be permitted to terminate through exterior walls when a scrubber system with removal of 95% of grease and smoke is provided.

Kitchen ventilation for gas-fired kitchen ranges and hood ventilation fans must comply with installation requirements specified in the current adopted building, mechanical, and fuel gas codes.

Any venting not for combustion air intake or exhaust is required to have a downward-sloping exterior hood or an exterior cover with a lightweight damper.

Kitchen exhaust to the building exterior must be through the stove/range/cook top hood, ventilation fan, downdraft ventilation or other approved whole kitchen ventilation systems.

https://up.codes/viewer/colorado/imc-2015/chapter/5/exhaust-systems#507

(Pages 474-475)