{"id":8318,"date":"2025-05-16T08:17:10","date_gmt":"2025-05-16T06:17:10","guid":{"rendered":"https:\/\/malux.com\/kunskapsbankinlagg\/ventilation-classification-of-hazardous-areas\/"},"modified":"2026-02-23T09:24:38","modified_gmt":"2026-02-23T08:24:38","slug":"ventilation-classification-of-hazardous-areas","status":"publish","type":"kunskapsbankinlagg","link":"https:\/\/www.malux.com\/en\/kunskapsbankinlagg\/ventilation-classification-of-hazardous-areas\/","title":{"rendered":"Ventilation &#8211; Classification of hazardous areas"},"content":{"rendered":"\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-94b0ecf stk-block-background\" data-block-id=\"94b0ecf\"><style>.stk-94b0ecf {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-94b0ecf:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-94b0ecf {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-94b0ecf-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-194d026\" data-v=\"4\" data-block-id=\"194d026\"><style>.stk-194d026 {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-194d026 {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-194d026-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-194d026-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-36f6796\" data-block-id=\"36f6796\"><style>.stk-36f6796 {margin-bottom:30px !important;}@media screen and (max-width: 1023px){.stk-36f6796 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\"><em><em><em> Exhaust ventilation shall be arranged so that explosive dust and explosive vapors are captured without first spreading into the room (local exhaust ventilation).<\/em><\/em><\/em><br\/><br\/>Hazardous areas whose limitation depends on mechanical ventilation should have negative pressure relative to the surroundings. The ventilation is designed to ensure thorough aeration of the hazardous area. <br\/><br\/>Sometimes there is a need for sectioning to prevent the spread of fire or pressure between several rooms in the same building. In these cases, it is necessary to section the ventilation system as well. This can be achieved, for example, through fire dampers or by having a completely separate ventilation system for each room.  <br\/><br\/>When designing ventilation systems, it is required that knowledge of and experience with the explosive substances to be handled form the basis for the design principle, materials, etc. For example, an exhaust fan for zone E1 must have the motor outside the airflow and should preferably be located outdoors. <\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-44ba255 stk-block-background\" data-block-id=\"44ba255\"><style>.stk-44ba255 {background-color:#ffdc2e !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-44ba255:before{background-color:#ffdc2e !important;}@media screen and (max-width: 767px){.stk-44ba255 {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-44ba255-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-6ccf675\" data-v=\"4\" data-block-id=\"6ccf675\"><style>.stk-6ccf675 {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-6ccf675 {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-6ccf675-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-6ccf675-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-370915b\" data-block-id=\"370915b\"><style>.stk-370915b {margin-bottom:30px !important;}.stk-370915b-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-370915b {margin-bottom:0px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-370915b-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-abbd3e7\" data-v=\"4\" data-block-id=\"abbd3e7\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-abbd3e7-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-abbd3e7-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-2d0f0b6\" id=\"tilluft\" data-block-id=\"2d0f0b6\"><h2 class=\"stk-block-heading__text\">Supply air<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-171e36a\" data-block-id=\"171e36a\"><style>@media screen and (max-width: 1023px){.stk-171e36a {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">Supply air can be provided by a fan or as transfer air from an adjacent non-fire or non-explosion hazardous room. Recirculated air should be avoided. <br\/><br\/>Supply air is introduced into the premises using diffusers, positioned so that thorough aeration of the hazardous area is achieved.<br\/><br\/>It is essential that supply air diffusers are placed so that the air is directed via the risk source toward the exhaust air diffusers.<br\/><br\/>Air intakes must not be placed within a hazardous area. This also applies to hazardous areas caused by explosive gas mixtures or combustible dust.  <\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-ed6de63\" data-v=\"4\" data-block-id=\"ed6de63\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-ed6de63-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-ed6de63-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-1313abe\" data-block-id=\"1313abe\"><style>@media screen and (max-width: 1023px){.stk-1313abe {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">Supply air units with associated electrical equipment should ideally be placed outside the hazardous area. A supply air system that ventilates a hazardous area and is located outside of it is not considered a hazardous area. Parts of the supply air system through which air flows are usually not regarded as a hazardous area, regardless of whether a supply air duct may be located within a hazardous area.  <br\/><br\/>Water-heated heating coils should be used for heating supply air. Regarding the use of electric fan heaters. <br\/><\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-3340d8d stk-block-background\" data-block-id=\"3340d8d\"><style>.stk-3340d8d {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-3340d8d:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-3340d8d {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-3340d8d-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-1d4aa1e\" data-v=\"4\" data-block-id=\"1d4aa1e\"><style>.stk-1d4aa1e {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-1d4aa1e {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-1d4aa1e-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-1d4aa1e-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-6fd47e2\" data-block-id=\"6fd47e2\"><style>.stk-6fd47e2 {margin-bottom:30px !important;}.stk-6fd47e2-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-6fd47e2 {margin-bottom:0px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-6fd47e2-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-62531db\" data-v=\"4\" data-block-id=\"62531db\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-62531db-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-62531db-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-137882c\" id=\"franluft\" data-block-id=\"137882c\"><h2 class=\"stk-block-heading__text\">Exhaust air<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-a26f843\" data-block-id=\"a26f843\"><style>@media screen and (max-width: 1023px){.stk-a26f843 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">The majority of the exhaust air is taken near the risk source.<br\/>Exhaust air ducts from zone E1 shall terminate at a suitable location and must not be combined with ducts for other ventilation. Where possible, exhaust air is supplemented with full or partial encapsulation (hoods) of units from which dust spreads. When installing ventilation, cleaning possibilities must be taken into account.<br\/>Exhaust air ducts are usually classified the same as the hazardous area from which the air is drawn.<br\/>A suitably designed exhaust air system with well-functioning local ventilation can result in a reduction of the extent of the classified area.  <br\/><br\/><strong>Exhaust air devices<\/strong><br\/>Exhaust air devices (nozzles, hoods, etc.) shall be designed so that air pollutants are captured in the best possible way. If a dusting activity is carried out within a limited area, such as a fume hood, and the air velocity in the openings is 0.5 m\/s or more, zone E1 can be considered not to extend beyond this area. <br\/><strong>Ventilation ducts<\/strong><br\/>Ventilation ducts shall be designed so that they can be easily dismantled, inspected, and cleaned both internally and externally. This can be achieved through, for example, quick couplings and ducts with smooth internal surfaces. They shall also be designed to avoid the accumulation of explosive substances.  <\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-01778c3\" data-v=\"4\" data-block-id=\"01778c3\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-01778c3-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-01778c3-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-e7565aa\" data-block-id=\"e7565aa\"><style>@media screen and (max-width: 1023px){.stk-e7565aa {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">When carrying out classification, consideration shall be given to the need for such operational measures that result in closed systems being opened for, for example, filter replacement, maintenance work, emptying or cleaning.\n\nWhen classifying a hazardous area, future changes should be taken into account that may mean the hazardous area is assigned a stricter classification.\n\nIf the production equipment is designed in such a way that the explosive substance may be released, which is the case for most mechanical installations (apparatus), it is necessary to determine the type of source of risk. The source of risk may be primary or secondary. This is determined based on the definition in the article Sources of risk and hazardous areas.  \n\nExamples of a primary source of risk include all open handling of explosive substances where dust, liquid or vapour may be emitted to the surroundings to a significant extent and thereby cause damage if the substance ignites. A primary source of risk generally results in a zone E1 area. \n\nExamples of a secondary source of risk are places where, during normal operation, explosive substances are not dispersed to the surroundings but where, due to operational disturbances, etc., which do not need to be of an accident or catastrophic nature, releases may occur. Such places may be flange joints, mechanical seals, non-tight-fitting covers, etc. \n\nOnce the source of risk has been determined, it is necessary to determine the magnitude of the release and to consider other factors that may affect the zones and their extent.<\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-dd5303e stk-block-background\" data-block-id=\"dd5303e\"><style>.stk-dd5303e {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-dd5303e:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-dd5303e {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-dd5303e-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-fb095a1\" data-v=\"4\" data-block-id=\"fb095a1\"><style>.stk-fb095a1 {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-fb095a1 {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-fb095a1-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-fb095a1-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-b55157f\" data-block-id=\"b55157f\"><style>.stk-b55157f {margin-bottom:30px !important;}.stk-b55157f-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-b55157f {margin-bottom:0px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-b55157f-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-daf32bb\" data-v=\"4\" data-block-id=\"daf32bb\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-daf32bb-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-daf32bb-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-342a657\" id=\"atgarder-i-riskomrade\" data-block-id=\"342a657\"><h3 class=\"stk-block-heading__text\">Measures in hazardous areas<\/h3><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-994ff68\" data-block-id=\"994ff68\"><style>@media screen and (max-width: 1023px){.stk-994ff68 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">The majority of the exhaust air is taken near the risk source.<br\/><br\/>Exhaust air ducts from zone E1 shall terminate at a suitable location and must not be combined with ducts for other ventilation. Where possible, exhaust air is supplemented with full or partial encapsulation (hoods) of units from which dust spreads. When installing ventilation, cleaning possibilities must be taken into account.  <br\/><br\/>Exhaust air ducts are usually classified the same as the hazardous area from which the air is drawn.<br\/><br\/>A suitably designed exhaust air system with well-functioning local ventilation can result in a reduction of the extent of the classified area.<br\/><br\/><strong>Exhaust air devices<\/strong><br\/>Exhaust air devices (nozzles, hoods, etc.) shall be designed so that air pollutants are captured in the best possible way. If a dusting activity is carried out within a limited area, such as a fume hood, and the air velocity in the openings is 0.5 m\/s or more, zone E1 can be considered not to extend beyond this area. <br\/><br\/><strong>Ventilation ducts<\/strong><br\/>Ventilation ducts shall be designed so that they can be easily dismantled, inspected, and cleaned both internally and externally. This can be achieved through, for example, quick couplings and ducts with smooth internal surfaces. They shall also be designed to avoid the accumulation of explosive substances.  <\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-c9b1d64\" data-v=\"4\" data-block-id=\"c9b1d64\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-c9b1d64-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-c9b1d64-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-260632f\" data-block-id=\"260632f\"><style>@media screen and (max-width: 1023px){.stk-260632f {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">Ducts shall be made as short and straight as possible, and system components that cause unwanted flow losses due to their design, such as T-pieces, sharp bends, and transitions, should be avoided. To avoid charging due to static electricity, all parts of the ventilation system shall be equipotentially bonded. \n\nDust separation\nIn cases where the exhaust air contains explosive dust, the system should have dust separation.\n\nIn many cases, explosive dust can be phlegmatized (made less sensitive) with water, which is why wet separators may be suitable.\n\nProcedures for emptying dust separators shall be in place to limit the amount of explosive dust in the separator.\n\nThe efficiency of the dust separator should be checked regularly, for example, by inspecting the duct between the separator and the fan.\n\nEnergy recovery\nRecirculated air or the installation of heat exchangers can be accepted from zone E2 and zone E3, provided there is no risk of dust deposition, condensate, or sublimate.<\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-b38ad0e stk-block-background\" data-block-id=\"b38ad0e\"><style>.stk-b38ad0e {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-b38ad0e:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-b38ad0e {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-b38ad0e-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-ca538ba\" data-v=\"4\" data-block-id=\"ca538ba\"><style>.stk-ca538ba {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-ca538ba {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-ca538ba-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-ca538ba-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-27ee891\" data-block-id=\"27ee891\"><style>.stk-27ee891 {margin-bottom:30px !important;}.stk-27ee891-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-27ee891 {margin-bottom:0px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-27ee891-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-da330bc\" data-v=\"4\" data-block-id=\"da330bc\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-da330bc-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-da330bc-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-5cd1834\" id=\"ventilationsmangder\" data-block-id=\"5cd1834\"><h3 class=\"stk-block-heading__text\">Ventilation rates<\/h3><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-95fe23e\" data-block-id=\"95fe23e\"><style>@media screen and (max-width: 1023px){.stk-95fe23e {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">General guidelines for required ventilation cannot be given. This must be determined on a case-by-case basis, taking into account factors such as the location of the risk source, the type and amount of explosive dust, the design of the local exhaust ventilation, and the distribution between local exhaust and general ventilation. <\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-8fa45a2\" data-v=\"4\" data-block-id=\"8fa45a2\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-8fa45a2-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-8fa45a2-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-028ecf5\" id=\"skyddsatgarder-vid-mekanisk-ventilation\" data-block-id=\"028ecf5\"><h3 class=\"stk-block-heading__text\">Protective measures for mechanical ventilation<\/h3><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-9b5197f\" data-block-id=\"9b5197f\"><style>@media screen and (max-width: 1023px){.stk-9b5197f {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">Ventilation failure is addressed, for example, by disconnecting electrical equipment that does not meet the requirements for the hazardous area created by the ventilation failure and by suspending operations.\n\nThe consequences of the ventilation failure are considered before reconnecting electrical equipment.<\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-ae3776a stk-block-background\" data-block-id=\"ae3776a\"><style>.stk-ae3776a {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-ae3776a:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-ae3776a {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-ae3776a-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-dd9beb2\" data-v=\"4\" data-block-id=\"dd9beb2\"><style>.stk-dd9beb2 {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-dd9beb2 {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-dd9beb2-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-dd9beb2-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-2d51515\" data-block-id=\"2d51515\"><style>.stk-2d51515 {margin-bottom:30px !important;}.stk-2d51515-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-2d51515 {margin-bottom:0px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-2d51515-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-2fafc88\" data-v=\"4\" data-block-id=\"2fafc88\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-2fafc88-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-2fafc88-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-6aa396a\" data-block-id=\"6aa396a\"><style>@media screen and (max-width: 1023px){.stk-6aa396a {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\"><br\/><br\/>SEK Swedish Electrotechnical Standard<\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-3370513\" data-v=\"4\" data-block-id=\"3370513\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-3370513-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-3370513-inner-blocks\"><\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>When handling, and especially when manufacturing, explosive substances, mechanical ventilation is generally required to limit the &#8230;<\/p>\n","protected":false},"featured_media":8308,"template":"","meta":{"_acf_changed":false},"kunskapsbankskategori":[240],"class_list":["post-8318","kunskapsbankinlagg","type-kunskapsbankinlagg","status-publish","has-post-thumbnail","hentry","kunskapsbankskategori-ex-industry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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