{"id":2035,"date":"2022-04-30T16:14:02","date_gmt":"2022-04-30T16:14:02","guid":{"rendered":"https:\/\/p69.com.vn\/?p=2035"},"modified":"2022-06-03T09:16:05","modified_gmt":"2022-06-03T09:16:05","slug":"lap-dat-ong-gio-hut-khoi-hanh-lang","status":"publish","type":"post","link":"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/","title":{"rendered":"Installing the corridor smoke exhaust duct: How to install, design diagram"},"content":{"rendered":"<p>Installing the <strong>corridor smoke exhaust duct<\/strong> is a system installed in units such as businesses, apartments, schools&#8230; With one purpose is to ensure the air source is as ventilated as possible. To serve the process of escape in the event of an unfortunate fire. So you know the purpose, the reasons why you have to install the corridor smoke duct? Steps to install the corridor smoke exhaust duct? Let&#8217;s find out with <a href=\"https:\/\/p69.com.vn\/en\" target=\"_blank\" rel=\"noopener\">P69 Mechanical Factory<\/a> in this article!<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_45 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" area-label=\"ez-toc-toggle-icon-1\"><label for=\"item-69f26158b0572\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input  type=\"checkbox\" id=\"item-69f26158b0572\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-visibility-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#What_is_an_exhaust_fan_smoke_exhaust\" title=\"What is an exhaust fan, smoke exhaust?\">What is an exhaust fan, smoke exhaust?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Why_install_the_corridor_smoke_exhaust_duct\" title=\"Why install the corridor smoke exhaust duct?\">Why install the corridor smoke exhaust duct?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Installing_corridor_smoke_exhaust_ducts_purpose\" title=\"Installing corridor smoke exhaust ducts purpose\">Installing corridor smoke exhaust ducts purpose<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Structure_of_the_corridor_smoke_exhaust_duct\" title=\"Structure of the corridor smoke exhaust duct\">Structure of the corridor smoke exhaust duct<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Standards_applied_to_calculate_design_and_install_corridor_smoke_extraction_systems\" title=\"Standards applied to calculate, design and install corridor smoke extraction systems\">Standards applied to calculate, design and install corridor smoke extraction systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Steps_to_install_corridor_smoke_exhaust_ducts\" title=\"Steps to install corridor smoke exhaust ducts\">Steps to install corridor smoke exhaust ducts<\/a><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Step_1_You_need_to_clearly_grasp_at_least_2_standards_commonly_used_to_design_a_corridor_smoke_exhaust_system_which_are\" title=\"Step 1: You need to clearly grasp at least 2 standards commonly used to design a corridor smoke exhaust system, which are:\">Step 1: You need to clearly grasp at least 2 standards commonly used to design a corridor smoke exhaust system, which are:<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Working_principle_of_the_corridor_smoke_exhaust_duct_system\" title=\"Working principle of the corridor smoke exhaust duct system\">Working principle of the corridor smoke exhaust duct system<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/p69.com.vn\/en\/lap-dat-ong-gio-hut-khoi-hanh-lang\/#Contact_information_P69_-_M_E_Contractor\" title=\"Contact information P69 \u2013 M&amp;E Contractor\">Contact information P69 \u2013 M&amp;E Contractor<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_an_exhaust_fan_smoke_exhaust\"><\/span>What is an exhaust fan, smoke exhaust?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Exhaust fan is a device that circulates air from outside to inside. The device is widely used in many places such as offices, buildings, large constructions and also in households. Especially in places where air cannot circulate on its own.<\/p>\n<figure id=\"attachment_2046\" aria-describedby=\"caption-attachment-2046\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2046\" src=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/quat-hut-gio.jpg\" alt=\"Qu\u1ea1t th\u00f4ng gi\u00f3, h\u00fat kh\u00f3i\" width=\"500\" height=\"500\" srcset=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/quat-hut-gio.jpg 500w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/quat-hut-gio-300x300.jpg 300w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/quat-hut-gio-100x100.jpg 100w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/quat-hut-gio-150x150.jpg 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-2046\" class=\"wp-caption-text\"><em>Ventilation fan, smoke extraction<\/em><\/figcaption><\/figure>\n<p>The smoke exhaust fan is responsible for bringing the smoke in the corridor to the outside, bringing fresh air in, creating a favorable environment for people to be able to.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_install_the_corridor_smoke_exhaust_duct\"><\/span>Why install the corridor smoke exhaust duct?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The design of the corridor smoke exhaust is one of the mandatory tasks of the designer of the ventilation and air conditioning system, there are 2 main purposes of the corridor smoke exhaust design, which are:<\/p>\n<ul>\n<li>Firstly, under normal conditions, the corridor is a place where many people pass, so there is a lot of dust in the air or C02 emissions from people, substances rising from cleaning chemicals, floor cleaning.. so this system will take care of odor removal under normal conditions.<\/li>\n<li>Secondly, in the event of a fire, the system will operate with a higher capacity to suck smoke from the corridor out, helping people not to be suffocated and also being able to see the way to the exit stairs.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Installing_corridor_smoke_exhaust_ducts_purpose\"><\/span>Installing corridor smoke exhaust ducts purpose<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Keep smoke and toxic fumes away from emergency exits. Proceed to collect burning smoke, smoke through the pipe is taken out. Make the exits along the stairs as clear as possible. In order to facilitate the fastest escape or help people in distress find safe shelter. Hold out while waiting for help to arrive. Benefits of the system:<\/p>\n<ul>\n<li>Temporary life protection: Protecting people&#8217;s lives in the event of a fire by means of dangerous routes or temporary hiding places.<\/li>\n<li>Anti-flame: let the anti-fire action take effect. Then the elevator shafts or stairs need to be maintained with differential pressure to prevent smoke from entering the burned floor. When the floor is on fire, there is or is an air conditioning system.<\/li>\n<\/ul>\n<figure id=\"attachment_2047\" aria-describedby=\"caption-attachment-2047\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2047 size-full\" title=\"M\u1ee5c \u0111\u00edch c\u1ee7a l\u1eafp \u0111\u1eb7t \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang\" src=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/tam-quan-trong-cua-he-thong-hut-khoi-hanh-lang-pccc-1.jpg\" alt=\"M\u1ee5c \u0111\u00edch c\u1ee7a l\u1eafp \u0111\u1eb7t \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang\" width=\"1000\" height=\"600\" srcset=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/tam-quan-trong-cua-he-thong-hut-khoi-hanh-lang-pccc-1.jpg 1000w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/tam-quan-trong-cua-he-thong-hut-khoi-hanh-lang-pccc-1-600x360.jpg 600w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/tam-quan-trong-cua-he-thong-hut-khoi-hanh-lang-pccc-1-300x180.jpg 300w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/tam-quan-trong-cua-he-thong-hut-khoi-hanh-lang-pccc-1-768x461.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-2047\" class=\"wp-caption-text\"><em>Purpose of installing corridor smoke exhaust ducts<\/em><\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Structure_of_the_corridor_smoke_exhaust_duct\"><\/span>Structure of the corridor smoke exhaust duct<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li aria-level=\"1\">NPF industrial exhaust fan.<\/li>\n<li aria-level=\"1\">Air duct system: zinc corrugated iron pipe.<\/li>\n<li aria-level=\"1\">Sensors, power cabinets and controls.<\/li>\n<li aria-level=\"1\">Open and close valve, fire stop valve.<\/li>\n<li aria-level=\"1\">Air supply door, smoke exhaust door.<\/li>\n<\/ul>\n<figure id=\"attachment_2044\" aria-describedby=\"caption-attachment-2044\" style=\"width: 424px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2044 size-full\" title=\"C\u1ea5u t\u1ea1o c\u1ee7a \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang\" src=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/cau-tao-he-thong-hut-khoi-hanh-lang.jpg\" alt=\"C\u1ea5u t\u1ea1o c\u1ee7a \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang\" width=\"424\" height=\"645\" srcset=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/cau-tao-he-thong-hut-khoi-hanh-lang.jpg 424w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/cau-tao-he-thong-hut-khoi-hanh-lang-197x300.jpg 197w\" sizes=\"auto, (max-width: 424px) 100vw, 424px\" \/><figcaption id=\"caption-attachment-2044\" class=\"wp-caption-text\"><em>Structure of the corridor smoke exhaust duct<\/em><\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Standards_applied_to_calculate_design_and_install_corridor_smoke_extraction_systems\"><\/span>Standards applied to calculate, design and install corridor smoke extraction systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>TCVN 5687 \u2013 2010: Ventilation, air conditioning and heating \u2013 Design standards.<\/li>\n<li>TCXDVN 323 \u2013 2004: Vietnam construction standards for high-rise buildings \u2013 design standards.<\/li>\n<li>AS 1668.1-1998: Australian smoke exhaust design standard.<\/li>\n<li>DW 142\/144: Duct installation standards<\/li>\n<li>MACNA: Sheet Metal &amp; Air Conditioning Contractor&#8217;s National Association<\/li>\n<li>CP553: Singapore&#8217;s ventilation design standard.<\/li>\n<li>TT07 BXD 2010: National technical regulation on fire safety for houses and works<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Steps_to_install_corridor_smoke_exhaust_ducts\"><\/span>Steps to install corridor smoke exhaust ducts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h4><span class=\"ez-toc-section\" id=\"Step_1_You_need_to_clearly_grasp_at_least_2_standards_commonly_used_to_design_a_corridor_smoke_exhaust_system_which_are\"><\/span>Step 1: You need to clearly grasp at least 2 standards commonly used to design a corridor smoke exhaust system, which are:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li aria-level=\"1\">TCVN 5687-2010<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Singapore SS553:2009 Standard<\/li>\n<\/ul>\n<p>It is necessary to design smoke extraction for corridors with a length of more than 15m without natural lighting<\/p>\n<p>The smoke intake is placed on the ceiling of the corridor or the ceiling of the hall, and the length of the corridor by one smoke intake must not exceed 30m.<\/p>\n<p>It is only allowed to design a maximum of 2 smoke intakes per corridor (this issue is also very sensitive; when designing, you should ask the fire department; if the corridor is too long, it is also possible to design 3 smoke intakes. )<\/p>\n<p>Calculate the smoke extraction flow<\/p>\n<p><strong>Step 2: After calculating the smoke exhaust volume in the corridor. We will go to calculate the size of the wind, the size of the duct<\/strong><\/p>\n<p><strong>Step 3: Design the corridor smoke exhaust on a flat surface<\/strong><\/p>\n<figure id=\"attachment_2043\" aria-describedby=\"caption-attachment-2043\" style=\"width: 480px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2043 size-full\" title=\"l\u1eafp \u0111\u1eb7t \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang\" src=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/ong-hut-gio-hanh-lang.jpg\" alt=\"l\u1eafp \u0111\u1eb7t \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang\" width=\"480\" height=\"271\" srcset=\"https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/ong-hut-gio-hanh-lang.jpg 480w, https:\/\/p69.com.vn\/wp-content\/uploads\/2022\/04\/ong-hut-gio-hanh-lang-300x169.jpg 300w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><figcaption id=\"caption-attachment-2043\" class=\"wp-caption-text\"><em>Install the corridor smoke exhaust duct<\/em><\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Working_principle_of_the_corridor_smoke_exhaust_duct_system\"><\/span>Working principle of the corridor smoke exhaust duct system<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When a fire occurs on any floor in a building, smoke and heat will be generated. The smoke detector of the fire alarm system will act to send the signal to the fire alarm center, the fire alarm center will transmit the signal to the smoke exhaust fan cabinet (usually located on the roof) to act on the smoke exhaust fan.<\/p>\n<p>&#8211; Motorized air valves (MFDs) installed on floors are normally closed and opened by two ways: open by a fire alarm signal from the central cabinet or open by button action. Forced pressing from the push button cabinet is located in the fire protection room on the 1st floor.<\/p>\n<p>&#8211; When the MFD valves are opened, the smoke of the burned corridor will be sucked into the vents in the corridor along the vertical axis and then pushed to the roof to the outside. At the same time, the system of bells and fire alarm lights works to warn people operating in the buildings to evacuate to the corridors to run to the exits.<\/p>\n<p>&#8211; Depending on the design unit or the appraiser (belonging to the agency or the fire protection department) will add a fire blanket valve with a fuse (FD) after the MFD valve or require the MFD valve to have an additional fire blocking function.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_information_P69_-_M_E_Contractor\"><\/span>Contact information P69 \u2013 M&amp;E Contractor<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Headquarter:<\/strong> No. 6\/165C Xuan Thuy, Cau Giay District, Hanoi<\/p>\n<p><strong>Website:<\/strong> https:\/\/p69.com.vn\/<\/p>\n<p><strong>Hotline:<\/strong> 02422121212 \u2013 0965937799<\/p>\n<p><strong>Email:<\/strong> kd@cokhip69.com.vn<\/p>\n<p><strong>Facebook:<\/strong>\u00a0<a href=\"https:\/\/www.facebook.com\/p69nhathaucodien\">https:\/\/www.facebook.com\/p69nhathaucodien<\/a><\/p>\n<p><strong>LinkedIn:<\/strong>\u00a0<a href=\"https:\/\/www.linkedin.com\/in\/congtyp69\/\">https:\/\/www.linkedin.com\/in\/congtyp69\/<\/a><\/p>\n<p><strong>Youtube:<\/strong> <a href=\"https:\/\/www.youtube.com\/channel\/UCOUwCnE5iGj8iqe_ZIUM7oA\">https:\/\/www.youtube.com\/channel\/UCOUwCnE5iGj8iqe_ZIUM7oA<\/a><\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;2035&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;2&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (2 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (2 votes)    <\/div>\n    <\/div>","protected":false},"excerpt":{"rendered":"<p>Installing the corridor smoke exhaust duct is a system installed in units such as businesses, apartments, schools&#8230; With one purpose is to ensure the air source is as ventilated as possible. To serve the process of escape in the event of an unfortunate fire. So you know the purpose, the reasons why you have to [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2047,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2035","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.1.1 (Yoast SEO v20.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L\u1eafp \u0111\u1eb7t \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang: C\u00e1ch l\u1eafp, s\u01a1 \u0111\u1ed3 thi\u1ebft k\u1ebf<\/title>\n<meta name=\"description\" content=\"L\u1eafp \u0111\u1eb7t \u1ed1ng gi\u00f3 h\u00fat kh\u00f3i h\u00e0nh lang l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t t\u1ea1i c\u00e1c \u0111\u01a1n v\u1ecb nh\u01b0 doanh nghi\u1ec7p, chung c\u01b0, tr\u01b0\u1eddng 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