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5003.8.5.3 Fire extinguishing system.
Exhausted enclosures where flammable materials are used shall be protected by a fire extinguishing system in accordance with FC Chapter 9 and the construction codes, including the Building Code.
5003.8.6 Gas cabinets.
Where a gas cabinet is used to increase the maximum allowable quantity per control area or when the location of compressed gases in gas cabinets is provided to comply with the requirements of FC Chapter 60, the gas cabinet shall be in accordance with FC 5003.8.6.1 through 5003.8.6.3.
5003.8.6.1 Construction.
Gas cabinets shall be constructed of not less than 0.097-inch (2.5-mm) (No. 12 gauge) steel; provided with self-closing limited access ports or noncombustible windows to give access to equipment controls; and have all interior surfaces treated, coated or constructed of materials that are compatible with the hazardous materials stored.
5003.8.6.2 Ventilation.
The ventilation system for gas cabinets shall be designed to operate at a negative pressure relative to the surrounding area. Ventilation systems used for highly toxic and toxic gases shall additionally comply with the requirements of FC 6004.1.2. The ventilation system shall be installed in accordance with the construction codes, including the Mechanical Code.
5003.8.6.3 Maximum number of containers per gas cabinet.
The number of containers stored in a single gas cabinet shall not exceed three.
5003.8.7 Hazardous materials storage cabinets.
Where storage cabinets are used to increase maximum allowable quantity per control area or to comply with the requirements of this chapter, such cabinets shall be in accordance with FC 5003.8.7.1 and 5003.8.7.2.
5003.8.7.1 Construction.
All interior surfaces of such cabinets shall be treated, coated or constructed of materials that are nonreactive with the hazardous material stored. Cabinets shall either be listed in accordance with UL 1275 as suitable for the intended storage or constructed in accordance with the following:
1. Cabinets shall be of steel having a thickness of not less than 0.0478 inch (1.2 mm) (No. 18 gauge). The cabinet, including the door, shall be double walled with a 1 1/2-inch (38 mm) airspace between the walls. Joints shall be riveted or welded and shall be tight fitting. Doors shall be well fitted, self-closing and equipped with a self-latching device.
2. The bottoms of cabinets utilized for the storage of liquids shall be liquid-tight to a minimum height of 2 inches (51 mm).
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