NFPA 660 8 ft³ Rule
For air-material separators handling combustible dust, a risk analysis should be provided to meet the goals of NFPA 660
NFPA 660 Standards on Explosion Prevention and Protection
The "dirty air volume" needs to be less than 8 cu ft
9.8.2.1 * Where an explosion hazard exists within any operating greater than 8 ft3 (0.2 m 3 ) of containing volume, the equipment shall be protected from the effects of an explosion.
XP Safe ORDLOC Dust Collector
XP Safe HAZLOC Dust Collector
Over 8 cu ft an XP vent is required
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