Gas groups

DNH produces explosion-proof loudspeakers.
Explosion-proof speakers will not ignite any gas in the surrounding area.

Below are the gases that each group are protected against:

 GROUP II
 IIA *
 IIB  IIC
 Propane
Ethylene
Acetylene
Hydrogen
*IIB and IIC cover IIA
IIC has a lower dB output than IIB.
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QUALITY ASSURANCE

During all stages of our manufacturing and production process, a fully documented and approved Quality Assurance System to ISO 9001 is imposed to ensure the highest quality throughout.
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DNH AS   Gruvevn. 2-4, 3770 Kragerø, Norway   Phone: + 47 35 98 56 00   Fax: + 47 35 98 56 10   E-mail: dnh@dnh.no  
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