{"id":1596,"date":"2026-07-08T07:59:28","date_gmt":"2026-07-08T07:59:28","guid":{"rendered":"https:\/\/climntech.com\/?p=1596"},"modified":"2026-07-17T08:02:45","modified_gmt":"2026-07-17T08:02:45","slug":"what-is-an-atex-zone-1","status":"publish","type":"post","link":"https:\/\/climntech.com\/en\/quest-ce-quune-zone-atex-1\/","title":{"rendered":"What is an ATEX Zone 1? Zone 2, Zone 21, Zone 22?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">In many industrial sectors, certain workspaces present a permanent or occasional risk of explosion. These environments receive a precise regulatory classification: they are referred to as ATEX zones, an acronym for\u2019<strong>AT<\/strong>atmospheres <strong>EX<\/strong>Plosives. For any HSE manager, establishment manager, or maintenance manager, mastering this classification is a legal obligation. Just as understanding its concrete implications for equipping workstations is an operational necessity. ClimnTech provides an overview.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is an explosive atmosphere?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An explosive atmosphere forms when a mixture of flammable substances (in the form of gas, vapor, mist, or dust) combines with air in sufficient proportions to ignite in the presence of an ignition source. If the combustion spreads instantaneously throughout the entire mixture, it causes a sudden pressure increase: this is an explosion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The distinction between atmosphere <em>explosive<\/em> and atmosphere <em>Explosible<\/em> It is important. An explosive atmosphere is already present under ignition conditions. An explosive atmosphere is likely to become one depending on local conditions: pipe leakage, pipe rupture, thermal variation, machine startup.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The sources of ignition that can trigger an explosion are numerous: electrical or electrostatic arcs, mechanical sparks, hot surfaces, and open flames. It is precisely this broad spectrum that necessitates strict regulations on all equipment deployed in these areas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The regulatory framework: two ATEX Directives<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">European regulation organizes responsibilities around two complementary directives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Directive 2014\/34\/EU<\/strong> (formerly 94\/9\/EC) is aimed at equipment manufacturers. It requires CE marking for equipment used in ATEX zones and defines the safety categories that each piece of equipment must comply with according to the zone in which it will be deployed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Directive 1999\/92\/EC<\/strong> It is addressed to employers. It obliges them to assess explosion risks in their facilities, to delineate ATEX zones, and to formalize this analysis in an Explosion Protection Document (DRPCE). This document must demonstrate that the risks have been assessed, that the measures taken meet the directive's requirements, and that the equipment used is compliant with the zone in which it operates. The zoning itself is carried out under the responsibility of the site manager.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ATEX Zones Classification: Gases and Dusts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ATEX zoning classifies areas based on the probable frequency and duration of an explosive atmosphere's presence. Two families of risks coexist: gas\/vapor\/mist atmospheres (Zone G) and dust atmospheres (Zone D).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Gas zones (G)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zone 0<\/strong> The explosive atmosphere is present permanently or for very long periods (more than 1,000 hours per year). Typical example: the inside of a tank containing a flammable liquid. Equipment deployed here must belong to Category 1G, the highest safety level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zone 1<\/strong> Explosive atmospheres are likely to occur occasionally during normal operation, between 10 and 1,000 hours per year. Examples: immediate vicinity of a valve or flange on a flammable product pipeline, area around a hydrocarbon storage vent. Required equipment is category 2G.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zone 2<\/strong> : An explosive atmosphere is unlikely during normal operation and, if it occurs, it only lasts for a short time (less than 10 hours per year). Examples: peripheral areas to Zone 1, ventilated rooms containing hazardous installations. Category 3G equipment is sufficient.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dust zones (D)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zone 20<\/strong> permanent or prolonged presence of flammable dust clouds. Required equipment category: 1D.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zone 21<\/strong> Occasional release of dust clouds during normal operation. Required Category: 2D. Affected sectors: flour mills, grain silos, sugar industries, wood processing, pharmaceuticals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zone 22<\/strong> : unlikely and short-lived presence of suspended dust. Required category: 3D.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A technical point to remember about dust: the visible presence of deposits already indicates a probability of a hazardous area. From 50 grams of dust per square meter (or 0.3 mm thick), the conditions for an explosion are met if this deposit is suspended in the presence of a sufficiently powerful ignition source.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Temperature class: a decisive parameter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Each piece of equipment deployed in an ATEX zone carries a temperature class, noted T1 to T6, which indicates the maximum surface temperature the device can reach. This value must remain below the auto-ignition temperature of the gas or dust present in the zone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, ethylene ignites spontaneously at 425 \u00b0C (T2 class), while certain organic dusts have much lower auto-ignition temperatures. Equipment classified as T4 does not exceed 135 \u00b0C on its surface. This covers the vast majority of common industrial environments.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Are you managing an ATEX-certified site and looking for compliant thermal comfort solutions? <a href=\"https:\/\/climntech.com\/en\/contact-climntech\/\">Contact ClimnTech experts for advice tailored to your area<\/a><\/strong><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Read the ATEX equipment marking<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Any device certified for ATEX zones bears a standardized marking that summarizes all of its safety features. Let's take the marking for ClimnTech coolers: II 2G IIB T4 Gb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This marking is deciphered as follows:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>II<\/strong> Group II, surface industry (as opposed to Group I, reserved for mines)<\/li>\n\n\n\n<li><strong>2G<\/strong> Category 2, gaseous atmospheres, usable in Zone 1 and Zone 2<\/li>\n\n\n\n<li><strong>IBM<\/strong> : gas subgroup, covering ethylene and products of the same or lower hazard level (propane, methane, etc.)<\/li>\n\n\n\n<li><strong>T4<\/strong> maximum surface temperature of 135 \u00b0C<\/li>\n\n\n\n<li><strong>Ah<\/strong> high gas protection level<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This marking specifically means that the equipment can be deployed in Zone 1. The most common level of hazard in surface industries with a risk of gas explosion.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sectors concerned by ATEX zones<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ATEX zones are found across a very wide industrial spectrum:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Petrochemicals and refining<\/strong> around storage tanks, distillation columns, and pumping stations. The risk of flammable gases is constant in certain areas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pharmacy and fine chemicals<\/strong> handling of volatile organic solvents, reactors under controlled atmosphere.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Agribusiness<\/strong> cereal silos, malting plants, sugar refineries, flour mills, combustible organic dusts generate extensive zones 21 and 22.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Surface treatment and industrial painting<\/strong> Paint booths, drying areas with solvents.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Service stations and hydrocarbon depots<\/strong> unloading zones, fill pits, vent surroundings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Water treatment and methanization<\/strong> biogas production and storage areas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thermal comfort in ATEX zones: a challenge that most equipment cannot solve<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the paradox faced by all ATEX site managers: legal obligations to protect workers from heat apply with the same force in an explosive zone as in a standard workshop. However, usual cooling and heating solutions (standard mobile air conditioners, fan heaters, convectors) cannot be used there. Their unprotected electric motors, heating elements, or contactors all constitute potential ignition sources.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/climntech.com\/en\/\">ClimnTech<\/a> is one of the very few companies to offer certified thermal comfort solutions for the most demanding ATEX zones.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The <strong>ClimnTech Adiabatic Coolers<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">They carry the marking II 2G IIB T4 Gb, making them usable in Zone 1 and Zone 2 for gaseous atmospheres. Their operating principle (hot air passing through a humidified honeycomb medium) makes them naturally antistatic. Furthermore, the slight humidification of the air they produce reduces static electricity tension in the immediate environment. Far from worsening the risk, the adiabatic cooler actively contributes to containing it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The <strong>ClimnTech Far Infrared Heating Panels<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">They are also ATEX certified. With a surface temperature maintained between 70\u00b0C and 80\u00b0C (well below T3 (200\u00b0C) and T4 (135\u00b0C) classes), they directly heat the operator at their workstation without generating dangerous hot surfaces, exposed resistors, or forced ventilation. In winter, they represent the only targeted heating solution deployable in explosive zones without ignition risk.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The two ranges also rely on IECEx international certification, which facilitates their deployment at industrial sites outside the European Union.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What an HSE manager must check before any deployment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before introducing thermal equipment into an ATEX zone, three checks are necessary: the equipment category must match the zone level (category 2G minimum for Zone 1), the gas group covered by the certification must encompass the substances present on the site, and the temperature class must remain below the auto-ignition temperature of the most sensitive product in the zone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/climntech.com\/en\/about\/\">ClimnTech Equipment<\/a> explicitly detail each of these parameters in their technical documentation, in accordance with the requirements of Directive 2014\/34\/EU.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Do you wish to equip an ATEX zone with certified cooling or heating? <a href=\"https:\/\/climntech.com\/en\/contact-climntech\/\">Request your sizing study from the ClimnTech team.<\/a><\/strong><\/p>\n<\/blockquote>","protected":false},"excerpt":{"rendered":"<p>In many industrial sectors, certain workspaces pose a permanent or occasional risk of explosion. These environments are subject to a specific regulatory classification: they are referred to as ATEX zones, an acronym for ATmosph\u00e8res EXplosives. For any HSE manager, facility manager, or maintenance manager, understanding this classification is a legal requirement. Similarly, understanding its practical implications for workplace equipment is an operational necessity. ClimnTech provides an overview. What is an explosive atmosphere? An explosive atmosphere forms when a mixture of flammable substances (in the form of gases, vapors, mists, or dust) combines with air in proportions sufficient to ignite in the presence of an ignition source. If combustion spreads instantly throughout the entire mixture, it causes a sudden rise in pressure: this is an explosion. The distinction between an explosive atmosphere and a potentially explosive atmosphere is important. An explosive atmosphere is already in a state ready to ignite. An explosive-potential atmosphere is one that may become explosive depending on local conditions: a pipe leak, a pipe rupture, temperature fluctuations, or the startup of a machine. There are numerous ignition sources that can trigger an explosion: electric or electrostatic arcs, mechanical sparks, hot surfaces, and open flames. It is precisely this broad spectrum of risks that necessitates strict regulations for all equipment deployed in these areas. The Regulatory Framework: Two ATEX Directives European regulations organize responsibilities around two complementary directives. Directive 2014\/34\/EU (formerly 94\/9\/EC) applies to equipment manufacturers. It requires CE marking for devices used in ATEX zones and defines the safety categories that each piece of equipment must comply with based on the zone in which it will be deployed. Directive 1999\/92\/EC applies to employers. It requires them to assess explosion risks at their facilities, delineate ATEX zones, and document this analysis in an Explosion Protection Document (EPD). This document must demonstrate that the risks have been assessed, that the measures taken meet the directive\u2019s requirements, and that the equipment used is suitable for the zone in which it operates. The zoning process itself is the responsibility of the facility manager. ATEX Zone Classification: Gases and Dusts ATEX zoning classifies areas based on the frequency and duration of the likely presence of an explosive atmosphere. Two types of risks coexist: gas\/vapor\/mist atmospheres (G zones) and dust atmospheres (D zones). Gas Zones (G) Zone 0: The explosive atmosphere is present continuously or for very long periods (more than 1,000 hours per year). A typical example is the interior of a tank containing a flammable liquid. Equipment used here must be classified as Category 1G, the highest safety level. Zone 1: The explosive atmosphere is likely to occur occasionally during normal operation, between 10 and 1,000 hours per year. Examples: the immediate vicinity of a valve or flange on a pipeline carrying flammable products; the area around a hydrocarbon storage vent. The required equipment is Category 2G. Zone 2: An explosive atmosphere is unlikely to occur during normal operation, and if it does occur, it persists only briefly (less than 10 hours per year). Examples: Areas adjacent to Zone 1, ventilated rooms containing hazardous installations. Category 3G equipment is sufficient. Dust Zones (D) Zone 20: permanent or prolonged presence of flammable dust clouds. Required equipment category: 1D. Zone 21: occasional occurrence of dust clouds during normal operation. Required category: 2D. Affected sectors: flour mills, grain silos, sugar industries, wood processing, pharmaceuticals. Zone 22: Unlikely and short-lived presence of airborne dust. Required category: 3D. A key technical point to remember regarding dust: the visible presence of deposits already indicates a potential hazardous zone. Starting at 50 grams of dust per square meter (equivalent to a 0.3 mm layer), the conditions for an explosion are met if this deposit is suspended in the air in the presence of a sufficiently powerful ignition source. Temperature class: a decisive parameter Every piece of equipment deployed in an ATEX zone is assigned a temperature class, designated T1 through T6, which indicates the maximum surface temperature the device can reach. This value must remain below the auto-ignition temperature of the gas or dust present in the zone. For example, ethylene spontaneously ignites at 425 \u00b0C (class T2), while certain organic dusts have much lower auto-ignition temperatures. Equipment classified as T4 does not exceed 135 \u00b0C at the surface. This covers the vast majority of common industrial environments. Do you manage an ATEX-classified site and are looking for compliant thermal comfort solutions? Contact the experts at ClimnTech for advice tailored to your zone. Understanding ATEX Equipment Markings Any device certified for ATEX zones bears a standardized marking that summarizes all of its safety characteristics. Let\u2019s take a look at the marking on ClimnTech cooling units: II 2G IIB T4 Gb. This marking is interpreted as follows: In practical terms, this marking means that the equipment can be deployed in Zone 1\u2014the most common risk level in surface industries with a risk of gas explosions. Sectors Affected by ATEX Zones ATEX zones are found across a very broad industrial spectrum: Petrochemicals and refining: areas around storage tanks, distillation columns, and pump rooms. The risk of flammable gases is constant in certain areas. Pharmaceuticals and fine chemicals: handling of volatile organic solvents, reactors under controlled atmospheres. Food processing: grain silos, malting plants, sugar refineries, flour mills\u2014combustible organic dusts create extensive Zone 21 and 22 areas. Surface treatment and industrial painting: paint booths, drying areas using solvents. Gas stations and hydrocarbon storage facilities: unloading areas, filling pits, and areas near vents. Water treatment and anaerobic digestion: biogas production and storage areas. Thermal comfort in ATEX zones: a challenge that most equipment is unable to address<\/p>","protected":false},"author":1,"featured_media":1597,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1596","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu&#039;est-ce qu&#039;une zone ATEX 1 ? Zone 2, Zone 21, Zone 22 ? - ClimNTech<\/title>\n<meta name=\"description\" content=\"Quelles diff\u00e9rences entre Zone Atex 1, 2, 21 et 22 ? 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