Tagged: HEPA filtration

HEPA filtration

Recirculating Filtered Air: NFPA 660 Air Return Compliance

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Industrial dust collector with HEPA filters and air ducts, in dramatic lighting.

Dust collector air recirculation seems like an energy-saving win until you discover NFPA 660’s strict conditions that make outdoor exhaust the safer choice for most facilities. Key Takeaways: NFPA 660 Section 8.5 permits air recirculation only when exposure limits stay below 25% of OSHA PEL HEPA secondary filtration capturing 99.97% of particles at 0.3 microns … Read more

Combustible Dust Vacuum Requirements: What Makes a Vacuum Compliant

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Metal shop vacuum in workshop, dramatic lighting, fog simulating dust.

Combustible dust vacuum requirements separate life-safety equipment from disaster-waiting-to-happen. Standard shop vacuums are ignition sources disguised as cleaning equipment, their plastic bodies build static charges that can trigger the dust explosions you’re trying to prevent. Key Takeaways: Standard shop vacuums create static charges above 3,000 volts, enough to ignite most combustible dusts with MIE values … Read more

Combustible Dust Compliance Made Clear

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Topics Fundamentals NFPA Standards Dust Hazard Analysis Explosion Protection
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