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C. Any single area occupied for sales rooms, showrooms, offices, or similar spaces shall be separated from vehicle repair or parking areas by walls and floor or floor-ceiling assemblies having a fire resistance rating of not less than two (2) hours. D. Ceiling assemblies shall be constructed in such a manner as to restrict the passage of smoke, vehicle exhaust gases, and odors from the repair or parking area to these spaces. E. In cases of parts storage areas, it shall also be separated from all other portions of the building by walls or partitions and floor or floor-ceiling assemblies having a fire resistance rating of not less than two (2) hours. F. In areas of repair garages used for repair or servicing of vehicles, floor assemblies shall be constructed of noncombustible materials or, if combustible materials are used in the assembly, shall be surfaced with approved noncombustible material. Floors shall be liquid tight to prevent the leakage or seepage of liquids and shall be sloped to facilitate the movement of water, fuel, or other liquids to floor drains. G. In areas of repair garages where motor fuels are dispensed or where vehicles are serviced, floor drains shall be provided. They shall be properly trapped and shall discharge through an oil separator to the sewer or to an outside vented sump. H. The contents of oil separators and traps of floor drainage systems shall be collected at sufficiently frequent intervals to prevent oil from being carried into the sewers. Disposal of which shall be in accordance with Division 2 of this Chapter and Section 10.3.7.5 of this RIRR.I. Pits and sub-floor work areas shall comply with the following: 1. Walls, floors, and piers shall be constructed of masonry, concrete, or other suitable noncombustible material. 2. Pits shall have a minimum of two (2) unobstructed means of egress. Steps shall be noncombustible, slip resistant, and constructed with no accessible storage space beneath.
2623. Pits and sub-floor areas shall be provided with an individual ventilating system capable of providing a complete air change every five minutes (5 min) with the intake located near floor level. J. Repair garages shall be limited in height and area, depending on the type of construction, and shall be provided with proper ventilation fire protective system in accordance withthis RIRR. K. Below-grade areas occupied for repairing, or communicating areas located below a repair garage, shall be continuously ventilated by a mechanical ventilating system having positive means for exhausting indoor air at a rate of not less than one (1) m3/min per square meter of floor area. An approved means of ventilation shall be provided for introducing an equal amount of outdoor air. SECTION 10.4.10.2 OPERATIONA. Welding, Cutting and Hotworks Operations 1. Welding, cutting and hotworks operations shall be in accordance with Division 17 ofthis Chapter.