Full Technical Description: 3-1/2 Inch W X 3-1/16 D Size; UL 1203 Approval; Chemical and Petrochemical Plants Application; Feraloy Iron Alloy, Copper Free Aluminum Body Material; Acrylic Painted Electrogalvanized Aluminum, Natural Finished Body Finish; Applicable Standard NEC; Hub Size 3/4 Inch; Constructional Feature Dustproof, Explosionproof, Ignitionproof, Raintight; Enclosure Type Class I Div 1 Group B C D, Class I Div 2 Group B C D, Class II Div 1 Group E F G, Class II Div 2 Group F G, Class III, NEMA 3/7B/7C/7D/9E/9F/9G; EFS Model