This specification covers the requirements of recirculating systems rated 600 volts or less and intended for indoor use with integral and non-integral recirculating systems and for installation in commercial establishments using electric commercial cooking appliances for the preparation of food. This specification also identifies the physical and performance requirements of the filters and recirculating hoods, which include filter interlocks, hood airflow, grease emissions, and filtration efficiency.

1.1 This specification covers the requirements of recirculating systems rated 600 volts or less and intended for indoor use with integral and non-integral recirculating systems and for installation in commercial establishments using electric commercial cooking appliances for the preparation of food.