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505.8 Product-Conveying Ducts Classification
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Product-conveying ducts shall be classified according to their use, as follows:
|Class 1||-||Ducts conveying nonabrasives, such as smoke, spray, mists, fogs, noncorrosive fumes and gases, light fine dusts, or powders.|
|Class 2||-||Ducts conveying moderately abrasive particulate in light concentrations, such as sawdust and grain dust, and buffing and polishing dust.|
|Class 3||-||Ducts conveying Class 2 materials in high concentrations and highly abrasive materials in low concentrations, such as manganese, steel chips, and coke.|
|Class 4||-||Ducts conveying highly abrasive material in high concentrations.|
|Class 5||-||Ducts conveying corrosives, such as acid vapors.|
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