505.3 Reserved.

505.4 Other than Group R.

All domestic cooking appliances installed in cafeterias and in Group A-1, A-2, A-4, A-5, and M occupancies shall be provided with hoods and exhaust systems as required for the type of appliances and processes in accordance with Sections 506 and 507. In other than Group R occupancies, domestic appliances may be provided with domestic kitchen exhaust systems ducted to outdoors in accordance with this section provided that the installation complies with all of the following:

   1.   No more than two domestic cooking appliances are installed in each fire separated room or tenancy in other than Group E occupancies;

   2.   Each appliance shall have electric or gas connections and nameplate ratings not to exceed 10 kW for electric appliances or 75,000 Btu/h for gas appliances. Branch gas connections shall not be larger than 3/4 inch (19.1 mm) pipe;

   3.   The appliances shall not include open top broilers or fryers; and

   4.   The appliances are used for periodic, non-commercial, non-revenue generating purposes, except for in Group A-3 occupancies, where such appliances may be used a maximum of 8 hours per week to generate revenue.

Section MC 506: Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment

506.1 General.

Commercial kitchen hood ventilation ducts and exhaust equipment shall comply with the requirements of this section. Commercial kitchen grease ducts shall be designed for the type of cooking appliance and hood served. All ducts shall lead directly to the exterior of the building and terminate as required by Section 506.3.13 for Type 1 hoods and Section 506.4.2 for Type II hoods.

   Exception: Recirculating hoods that comply with Exception 2 of Section 507.1 do not require ducting in accordance with this section.