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This section applies only to industrial occupancies and refrigerated rooms for manufacturing, food and beverage preparation, meat cutting, other processes, and storage. Machinery rooms are not required where all of the following conditions are met:
1. The space containing the machinery is separated from other occupancies by tight construction with tight-fitting, self-closing doors.
2. Access is restricted to authorized personnel.
3. The floor area per occupant is not less than 100 square feet (9.3m) where machinery is located on floor levels where there exists more than 6.6 feet (2m) above ground. Where provided with egress directly to the outdoors or into approved building exists, the minimum floor area shall not apply.
4. Refrigerant detectors are installed as required for machinery rooms in accordance with Section 18-28-1105.5.
5. Surfaces having temperatures exceeding 800°F. (426.7°C.) and open flames are not present where any Group A2, B2, A3 or B3 refrigerant is used. (See Section 18-28-1104.3.4).
6. All electrical equipment and appliances conform to Class 1, Division 2, or NEPA 70 where the quantity of any Group A2, B2, A3, or B3 refrigerant in a single independent circuit would exceed 25 percent of the lower flammability limit upon release to the space.
7. All refrigerant-containing parts in systems exceeding 100 HP (74.6 kW) drive power, except evaporators used for refrigeration or dehumidification; control and pressure-relief valves for either; and connecting piping, shall be located either outdoors or in a machinery room.