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ANSI/ISA 12.04.04-2012

Pressurized Enclosures

This standard applies to equipment made suitable for use in hazardous (classified) locations by pressurizing the use of a pressurizing system. This standard applies both to equipment with and without an internal release of a flammable gas or vapor. This standard does not apply to occupied portions of buildings such as ventilated or pressurized control rooms.

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The International Society of Automation [isa]

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