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electrical work, or to the preparation and approval of plans, or to required fees for permits, inspections or reinspections. 2703.6 License required: A permit shall be issued only to a person who has a currently valid electrical license, electrical maintenance license, electrical industrial license, or electrical communications contractor license, duly issued by the Building Commissioner of St. Louis County, Missouri, or to a homeowner for work to be performed under a homeowner's permit. (CHAPTER 28 MECHANICAL SYSTEMS) (SECTION 2801 GENERAL) 2801.2 Mechanical code: All mechanical equipment and systems shall be constructed, installed and maintained in accordance with this chapter and the International Mechanical Code, 2003 Edition, listed in Chapter 35. (SECTION 2810 ADDITIONAL REQUIREMENTS) 2810.0 Boiler room security: Every boiler or combination boiler shall be located in an enclosed area designed to prevent unauthorized entry, secured with a locked door openable from the inside without the use of a key. Storage or living quarters shall not be permitted in any enclosure for a boiler or similar heating equipment. Exception: Heating boilers located in buildings of Group R-3 and Group R-2 containing six or fewer dwelling units. 2810.2 Mechanical draft system exhaust termination: The termination of mechanical draft system chimneys or vents equipped with power exhausters shall be located a minimum of 10 feet (304 nm) from the lot line or from an adjacent building on the same lot. The exhaust shall be directed away from the building. 2810.3 Kitchen exhaust system cleaning schedule: A cleaning schedule shall be maintained by the owner or occupant for every commercial kitchen exhaust system. The schedule shall indicate methods of cleaning and the time interval between cleaning. 2810.4 Boiler shutoff valves: Every boiler, including a single low-pressure steam boiler, or battery of modular units, shall have a shutoff valve in the supply and return piping. 15