Hood cleaning is REQUIRED in the state of California, according to the NFPA 96, your local fire authority, and/or your insurance company. Grease build up can be a serious fire hazard and is the leading cause of commercial kitchen fires. Proper cleaning of your commercial kitchen hood on a regular basis will greatly reduce the risk of a fire in your establishment. To find out more information about the frequency of hood cleaning, please refer to the NFPA 96 or contact your local fire authority.