In certain locations or with certain conditions, even air can present a hazard. If flammable gases, mists or vapours, or combustible dusts mix under atmospheric conditions with air, an explosive atmosphere may result. In such a case it needs only a source of ignition, e.g a spark, friction, heat or electrostatic discharge, to cause an explosion, which in turn can result in loss of life, serious injuries and significant damage.
It is hence essential that equipment and systems intended for use in areas with potentially explosive atmospheres are designed and installed in such a way that the health and safety of people are not at risk.
Air handling units which are to be installed in areas with potentially explosive atmospheres, or which circulate potentially explosive air, have to meet special requirements; system owners, specialist consultants, HVAC contractors and manufacturers all have to ensure that these requirements are met.
The legally binding measures required to avoid hazards and to improve safety for people at risk from explosive atmospheres are stipulated in Directive 1999/92/EC (ATEX 137) for system owners and in Directive 2014/34/EU for manufacturers
ATEX-compliant construction
Brass bearings, stainless steel as an option
Linkage and opposed action blades
Optional: ATEX actuators including spring return and auxiliary switch
Leakage class 2 to EN 1751, class 4 as an option
ATEX-compliant attachments:
Entirely metal
Easy-to-clean aluminium fins
Included in the earthing system
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