In 2015, the NFPA introduced 484 Standard for Combustible Metals to prohibit collecting aluminum, magnesium, and other combustible metal dust with dry downdraft tables, requiring that companies handling combustible dust implement wet downdraft tables and dust collectors to remain in compliance.

A combustible dust hazard can be determined when machine operators are: grinding, deburring, cutting, blasting, sieving, or polishing combustible metals, and if there is an ignition source present - such as weld arcs, electrical enclosures, grinding sparks, kilns, or stoves.

If your application involves any metals (aluminum, magnesium, niobium, tantalum, titanium, or zirconium) that can create explosive dust, NFPA 484: Standard for Combustible Metals applies to you.