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About Dampers : NEMA ENCLOSURE STANDARDS

NEMA ENCLOSURE STANDARDS

NEMA  1 Primarily indoors use to provide protection against contact with the enclosed equipment.
NEMA 3R Outdoor use primarily to provide a degree of protection against falling rain, sleet, and external ice formation.  Not intended to protect against dust.
NEMA 3 Outdoors use primarily to provide a degree of protection against windblown dust, rain, sleet, and external ice formation.
NEMA 4 Indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water and hose directed water.
NEMA 4X Indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, corrosion, splashing water and hose directed water.  *Stainless steel or fiberglass housing usually provided.
NEMA 6 Indoors or outdoors use primarily to provide a degree of protection against the entry of water during occasional temporary submersion at a depth of 6 feet for 30 minutes.  Not intended to provide protection against corrosive environments.
NEMA 12 Indoor use to provide a degree of protection against dust, falling dirt and dripping water.
NEMA 13 Indoor use to provide a degree of protection against dust, spraying of water, oil and noncorrosive coolant.

 ENCLOSURES FOR HAZARDOUS LOCATIONS 

NEMA  7 Indoor use for class I, Groups A, B, C or D.  It shall be capable of withstanding the pressures resulting from an internal explosion of specified gases.
NEMA  9 Indoors use for Class II, Groups E, F, and G.  Prevent entrance of dust and contain heat from devices so not to ignite or discolor accumulated dust on enclosure. 
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