Attributes . gas resistant class Gx ISA S71.04 || gas resistant class 3C4 IEC 60721-3-3 || dust resistant class 3S4 IEC 60721-3-3 || sand resistant class 3S4 IEC 60721-3-3 || salt resistant level 2 IEC 68252 || mold growth resistant class 3B2 IEC 60721-3-3 || fungal spore resistant class 3B2 IEC 60721-3-3 || hazardous location class I division 2 . Names