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Portable Network Graphic  |  1990-02-06  |  2KB  |  509x337  |  1-bit (2 colors)

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OCR: Measuring Air Contaminants Ethanol 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 confined space entry. %LEL should be < 10%.

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