The National Fire Protection Agency (NFPA) 96 Standard requires your kitchen exhaust system be professionally cleaned between once per month and once per year depending on the volume of food cooked, the type of food served, and the type of fuel used.

Ventilation System Cleaning Methods Most restaurant vent hoods are easy enough to clean. A good, thorough wash with hot, soapy water is enough to do the trick. Occasionally, dirty vent hoods may sit overnight in a soak tank. The soak tank has water with soap and other industrial cleaning chemicals such as degreaser.