Combustible Dust & Class II Division 2: NFPA 652 & 654 Guide

Combustible dust is responsible for hundreds of industrial fires and explosions annually. Learn what NFPA 652 and 654 require, what Class II Division 2 rated equipment means, and how to build a compliant housekeeping program.

What Is Combustible Dust?

Combustible dust is any fine particulate material — wood dust, grain dust, metal powders, plastic dust, sugar, flour — that can ignite and explode when suspended in air at sufficient concentration. NFPA 652 is the foundational standard; NFPA 654 covers manufacturing and processing facilities.

Class II Division 2 Equipment

Standard vacuum cleaners and cleaning equipment are not rated for combustible dust environments. Class II Division 2 rated equipment is specifically designed to prevent ignition of combustible dust — required by NFPA 654 for housekeeping in affected facilities.

Contact Aerroc at (571) 621-7233 for NFPA-compliant combustible dust removal across Northern Virginia, DC, and Maryland.