Limited Ventilation
Limited Ventilation :
Although ventilated at a rate of less than six (6) air changes per hour, certain rooms, buildings, and spaces may have a natural or a mechanical ventilation system which is sufficient to reasonably assure that significant quantities of vapor-air mixtures in concentration above 25% of the lower flammable (explosive) limit (LEL) will not accumulate for significant periods of time due to hydrocarbon emissions which are relatively small in size or short in duration. These areas are considered to have "limited ventilation". While such areas may justify a classification reduction from Division 1 to Division 2, they never should be considered as unclassified based on ventilation rates along. (RP 500B)
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