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of release to the system when it reaches equilibrium. <br />Exhaust vents or stacks shall be located in such a manner <br />as to prevent re-entry of hazardous gases into the build- <br />ing, or their entry into any adjacent buildings. <br />B. Gas Cabinets. When gas cabinets are provided <br />they shall be: <br />i. Operated at negative pressure in relation to <br />the surrounding area. <br />ii. Provided with self-closing limited access <br />ports or noncombustible windows to give access to <br />equipment controls. The average velocity of venti- <br />lation at the face of access ports or windows shall <br />be not less than 200 feet per minute ~fpm~ with a <br />minimum of 150 fpm at any point of the access port <br />or window. <br />iii. Connected to a treatment system. <br />iv. Provided with self-closing doors. <br />v. Constructed of not less than 12 gauge steel. <br />C. Separate Gas Storage Rooms. When separate gas <br />storage rooms are provided they shall be designed to: <br />i. Operate at a negative pressure in relation <br />to the surrounding area. <br />ii. Direct the exhaust system ventilation to <br />a treatment system. <br />D. Treatment Systems. <br />i. General. Treatment systems shall be utilized <br />to process all exhaust ventilation to be discharged <br />from gas cabinets or separate storage rooms. Treat- <br />ment systems shall be designed to reduce the maximum <br />allowable discharge concentration of the gas to one- <br />half IDLH at the paint of discharge to the atmosphere <br />as specified in items iii. and iv. below. When more <br />than one gas is emitted to the treatment system, the <br />treatment system shall be designed to handle the <br />worst case release based on the release rate, the <br />quantity, and the IDLH far all the gases stored or <br />used . Exhaust vents or stacks shal 1 be 1 ocated i n <br />such a manner as to prevent re-entry of hazardous <br />gases into the building, or their entry into adja- <br />cent buildings. <br />ii. Treatment System Sizing. Treatment systems <br />shall be sized to process the maximum worst case re- <br />lease of gas based on the maximum flow rate of re- <br />lease from the largest cylinder or tank utilized. <br />The entire contents of tanks and cylinders shall <br />be considered. <br />111. Statianary_Tanks. Stationary tanks shall <br />be labeled with the maximum rate of release for the <br />gas contained based an any valves or fittings that <br />are inserted directly into the tank. If multiple <br />valves or fittings are provided, the maximum flow <br />rate of release for the valve or fitting with the <br />highest flow rate shall be indicated. If 1 iquefied <br />Ordinance - 34 <br />