Class 3 Division 1 is an area where ignitible fibers/flyings are manufactured, handled or used, such as within textile mills or clothing manufacturing plants, facilities that create sawdust and flyings by pulverizing or cutting wood.

Sawdust and flyings may be defined as dust particles that are larger than 500 microns and present a fire or explosion hazard when dispersed and ignited in air.

How do I know if my dust is hazardous?
Many items that are generally regarded as harmless such as grains, metals, and dusts become a fire or explosion hazard when particles are less than 500 microns and dispersed in the air. In our many years of building custom explsoion proof units, we have never once been asked to build a Class 3 Division 1 product. It’s very rare.

North America specifies hazardous locations in classes, divisions, and groups. “Classes” define the general nature of the hazardous material in the surrounding atmosphere in three distinctions. Gasses (class I), Dusts (class II), and fibers/flyings (class III). Divisions represent the probability of the hazardous material in quantities sufficient for ignition. Division 1 is a high probability in normal conditions and division 2 being a low probability in abnormal conditions. While this specifications technically exist, we have never received a request for it. You may want to look at the Class 2 Division 1 post or give us a call to talk about your project specifics.

Class I Division 1
Class I Division 2
Class II Division 1
Class II Division 2

XP Climate Controls is a custom HVAC manufacturer that builds industrial air conditioners to exacting explosion proof and hazardous location specifications.

HVAC equipment comes in many shapes, sizes, functions, and classifications so if we don’t have your exact unit in stock, we will build it for you.