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Portable Network Graphic  |  1990-02-06  |  1.9 KB  |  509x337  |  1-bit (2 colors)
   ocr: Measuring Air Contaminants thanol in Air LEL UEL 0% 3% 18% 100% Explosive limits are not really defined in exact terms,hence the shaded areas represent potential danger areas. This is the reason for - requiring that conservative guidelines for %LEL be used for safe contined space entry. %LEL should be < 10%. -