Answer :
Final answer:
Dust must be dispersed or suspended into the air at the Lower Flammable Limit (LFL) for a combustible dust explosion or flash fire to occur.
Explanation:
For a combustible dust explosion or flash fire to occur, dust must be dispersed or suspended into the air at the:
- Lower Flammable Limit (LFL)
This is the minimum concentration of a combustible dust in the air below which a dust cloud cannot ignite. If the dust concentration exceeds this limit, it can lead to a combustible dust explosion or flash fire.
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