NFPA Requirements

Cleaning of Exhaust Systems

Performance Requirements for Cleaning Kitchen Exhaust Systems as per the National Fire Protection Association

11.4.1 Upon inspection, if found to be contaminated with deposits from grease-laden vapours, the entire exhaust system shall be cleaned by a properly trained, qualified, and certified company or person(s) acceptable to the authority having jurisdiction in accordance with Section 11.3.

11.4.2* Hoods, grease removal devices, fans, ducts, and other appurtenances shall be cleaned to bare metal prior to surfaces becoming heavily contaminated with grease or oily sludge.

11.4.3 At the start of the cleaning process, electrical switches that could be activated accidentally shall be locked out.

11.4.4 Components of the fire suppression system shall not be rendered inoperable during the cleaning process

11.4.5 Fire-extinguishing systems shall be permitted to be rendered inoperable during the cleaning process where serviced by properly trained and qualified persons in accordance with Section 11.3.

11.4.6 Flammable solvents or other flammable cleaning aids shall not be used.

11.4.7 Cleaning chemicals shall not be applied on fusible links or other detection devices of the automatic extinguishing system.

11.4.8 After the exhaust system is cleaned to bare metal, it shall not be coated with powder or other substance.

11.4.9 All access panels (doors) and cover plates shall be replaced.

11.4.10 Dampers and diffusers shall be positioned for proper airflow.

11.4.11 When cleaning procedures are completed, all electrical switches and system components shall be returned to a operable state.

11.4.12 When a vent cleaning service is used, a certificate showing date of inspection or cleaning shall be maintained on the premises.

11.4.13 After cleaning is completed, the vent cleaning contractorshall place or display within the kitchen area a label indicating the date cleaned and the name of the servicing company, and areas not cleaned.