General · G-JH2JZ

Hazardous Area Classification and Vent Riser Section

Materials

Steel Timber / Wood

Elements

Walls Stairs Roofs Parapets

Connections

Welded Connection

About this detail

Hazardous location classifications are defined around vent risers penetrating the roof and extending down an exterior wall assembly. Class 1, Division 1 and Class 1, Division 2 boundaries are established with specific radii from fittings and equipment openings. Stud bays containing vent risers are designated as Class 1, Division 2, but remain unclassified if using welded, threaded, or double-wall vent risers. An eighth-inch foam wrap is detailed at penetrations and foundations where required.

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