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F 1201.5.1 Air Quality Analysis
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During the period of air quality analysis, the air fill panel inlet shall be secured so that no air is capable of being introduced into the system and each air fill panel shall be provided with a sign stating, "AIR QUALITY ANALYSIS IN PROGRESS, DO NOT FILL OR USE ANY AIR FROM THIS SYSTEM." This sign shall be not less than 81/2 inches (218 mm) by 11 inches (279 mm) with not less than 1 inch (25.4 mm) lettering.