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0 • <br /> X <br /> VENTILATION Mechanical ventilation. Mechanical ventila- <br /> Ventilation is required for storage locations tion must include the following: <br /> containing greater than 3000 ft3 of gas.This can N• Continuous ventilation to maintain <br /> be provided with natural or mechanical exhaust. negative pressure in the space <br /> The volume of fluid to be used in determining • Rate of 1 cfm/5 ft3 of fluid designed to be <br /> ventilation is the volume(at STP)of the largest stored in the space <br /> single vessel or the entire volume of connected '+„. No less than 50 cfm <br /> vessels on a common manifold,whichever is • No more than 500 cfm <br /> greater. <br /> NA• Inlets that are unobstructed and draw from <br /> Natural ventilation. Natural ventilation within 1 ft of the floor <br /> must consist of two nonclosable louvered v• Exhaust fans supplied with power from the <br /> openings.These openings have the following essential electrical system <br /> requirements: • Dedicated exhaust not required, but the <br /> • Each opening must have an opening area of system cannot connect to spaces that <br /> at least 24 in.2/1000 ft3 of the fluid stored and contain flammable materials <br /> no less than 72 in.2. ``a • Exhaust duct of noncombustible <br /> • One opening must be located within 1 ft of construction <br /> the floor,and one must be within 1 ft of the • Make-up air that is provided by one of the <br /> ceiling. following: <br /> • Openings need to be located to ensure cross "y+ Noncombustible ductwork transferred <br /> ventilation. from adjacent spaces,outside or from <br /> • Openings have to be direct to the outside spaces that do not include flammable or <br /> atmosphere without ductwork. combustible material <br /> • A corridor under the door up to 50 cfm <br /> or 15 percent of the room exhaust per <br /> NFPA 90A,Standard for the Installation <br /> of Air-Conditioning and Ventilating <br /> Systems (whichever is greater) <br /> • Any building ventilation system <br /> that does not contain flammable or <br /> combustible vapors <br /> Precautions for Handling Cylinders <br /> • Handle oxygen cylinders and manifolds based on <br /> CGA G-4, Oxygen <br /> • Protect from contact with oil and grease <br /> • Protect from contamination <br /> • Protect from damage <br /> • Handle with care <br /> • Remove/repair defective equipment <br /> 0 NOTE: Discharge from both mechanical and natural ventilation systems requires <br /> minimum separation distances, per NFPA 55,Compressed Gases and Cryogenic <br /> Fluids Code. <br /> ©2018 National Fire Protection Association 4 g1 <br />