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The intended environment mainly determines an industrial control panel's enclosure. Installing and wiring components will require adequate room.
The use of a vent or air handling units may be essential if the control box is situated in high atmospheric temperature area's. If temperature management is required, then air intakes and exhaust vents should be easily accessible so that filters may be accessed and replaced. Both the NEC and UL clearance requirements surrounding electrical wiring and heat-producing equipment must be considered.