Explosion protection


A comprehensive risk and hazard analysis forms the basis for effective explosion control measures.

WOLF air handling units with ATEX certification in line with Directive 2014/34/EU guarantee protection from various types of ignition sources, such as static electricity, impermissible surface heating, mechanical sparks, flames, hot gases, lightning strike and adiabatic compression. WOLF air handling units are ideal for safe use in potentially explosive atmospheres.


The ATEX Directive obliges manufacturers to conduct a comprehensive risk analysis for the appliance, to define a specific application field and to have its conformity verified independently. TÜV SÜD confirms that WOLF appliances and components comply with Directive 2014/34/EU for use in accordance with their intended application in potentially explosive atmospheres with safety categories 2G and 3G, temperature classifications T1 to T4 or potentially explosive zones 1 and 2.


In addition to the ATEX Directive 2014/34/EU for the installer, ATEX Directive 1999/92/EG (ATEX 137) describes minimum requirements for the operator that must also be considered during planning. Compliance with both directives has been prescribed by law in all member states of the European Union since 1 July 2003.

Special features of WOLF air handling units in the ATEX variants

  • All housing and attachment parts are electrically conductive and earthed
  • ATEX-certified air filters with conductive filter media in conductive filter mounting frame
  • Fans with ATEX certification according to classification
  • All components (coils, silencers, louvres, heat recovery etc.) are electrically conductive and earthed
  • No materials are used that cause sparks or electrostatic charging. All attachment parts in ATEX-compliant design


A checklist specially developed by WOLF makes it easier for design engineers, operators and system installers to classify air handling units according to the directives.