As per Osha, in a confined space, less than 10 percent LEL is considered safe
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100% LEL is 5 %. So 10 % of it is 0.5%
No they are not.
The Lower Explosive Limit (LEL) of natural gas (which is primarily methane). is 5% by volume in air. The Upper Explosive Limit (UEL) is 15% by volume in air
The word "parallel" has three syllables, pronounced as PAR-a-lel.
Between 13 and 14. Be on the safe side.