www.safetyandhealthmagazine.com/articles/explosion-proof-vacuum-2

Explosion-proof vacuum

April 1, 2012
The CFM 118/50EXP vacuum is designed to collect dry dust and debris that often accumulates on floors and overhead areas in manufacturing facilities. It is CSA-certified explosion-proof and dust ignition-proof for use in Class I, Group D; and Class II, Groups E, F and G environments. Composed of non-sparking stainless steel, it is completely grounded.

Nilfisk Industrial Vacuum Division