| Air conditioners typically carry an agency marking such as UL (Underwriters Laboratories),
which designates the environmental hazard from which the contents are being protected.
This marking should be matched to the enclosure to be cooled. Typical examples include
NEMA 12, (indoor use, protection from dust and dripping liquids), NEMA 3R (indoor
or outdoor use and rainproof), NEMA 4 (indoor or outdoor use, protection from washdown)
and NEMA 4X (protection from corrosive environments).
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