{"id":941,"date":"2026-09-21T08:52:26","date_gmt":"2026-09-21T08:52:26","guid":{"rendered":"https:\/\/nanzhimachinery.com\/?p=941"},"modified":"2026-09-21T08:52:29","modified_gmt":"2026-09-21T08:52:29","slug":"how-many-exhaust-fans-does-a-factory-need","status":"publish","type":"post","link":"https:\/\/nanzhimachinery.com\/ru\/how-many-exhaust-fans-does-a-factory-need\/","title":{"rendered":"How Many Exhaust Fans Does a Factory Need?"},"content":{"rendered":"
\"NanZhi<\/figure>\n\n\n\n

One of the questions we often receive is:<\/p>\n\n\n\n

\u201cHow many exhaust fans do I need for my factory?\u201d<\/strong><\/p>\n\n\n\n

There is no fixed number. The first step is to calculate the workshop volume and then estimate the required airflow based on the air change rate.<\/p>\n\n\n\n

For general industrial workshops in China, around 6 air changes per hour (ACH)<\/strong> is often used as a starting point for preliminary ventilation calculation. The actual requirement can be higher if the workshop has heavy heat loads, smoke, dust or other pollutants.<\/p>\n\n\n\n

A Simple Example<\/h3>\n\n\n\n

Suppose a workshop is:<\/p>\n\n\n\n

    \n
  • 60 m long<\/li>\n\n\n\n
  • 30 m wide<\/li>\n\n\n\n
  • 6 m high<\/li>\n<\/ul>\n\n\n\n

    The workshop volume is:<\/p>\n\n\n\n

    60 \u00d7 30 \u00d7 6 = 10,800 m\u00b3<\/strong><\/p>\n\n\n\n

    If we use 6 air changes per hour:<\/p>\n\n\n\n

    10,800 \u00d7 6 = 64,800 m\u00b3\/h<\/strong><\/p>\n\n\n\n

    So the workshop needs about 64,800 m\u00b3\/h of exhaust airflow<\/strong>.<\/p>\n\n\n\n

    If one exhaust fan can provide an effective airflow of about 36,000 m\u00b3\/h<\/strong>, then:<\/p>\n\n\n\n

    64,800 \u00f7 36,000 = 1.8<\/strong><\/p>\n\n\n\n

    In this case, 2 exhaust fans<\/strong> would be a reasonable starting point.<\/p>\n\n\n\n

    Fan Airflow Is Not the Only Factor<\/h3>\n\n\n\n

    In real projects, we do not select the fan quantity only by dividing the required airflow by the rated fan airflow.<\/p>\n\n\n\n

    The final result can also be affected by:<\/p>\n\n\n\n

      \n
    • Air inlet size<\/li>\n\n\n\n
    • Louvers and safety guards<\/li>\n\n\n\n
    • Workshop layout<\/li>\n\n\n\n
    • Large machines or partitions<\/li>\n\n\n\n
    • Fan installation position<\/li>\n<\/ul>\n\n\n\n

      If fresh air cannot enter the workshop easily, the actual exhaust airflow will be lower.<\/p>\n\n\n\n

      A better arrangement is usually to place the exhaust fans on one side of the building and leave enough air inlets on the opposite side.<\/p>\n\n\n\n

      The airflow path should be:<\/p>\n\n\n\n

      Fresh air \u2192 Working area \u2192 Heat and stale air \u2192 Exhaust fan \u2192 Outside<\/strong><\/p>\n\n\n\n

      What Information Do We Need?<\/h3>\n\n\n\n

      For a basic factory ventilation calculation, we normally ask for:<\/p>\n\n\n\n

        \n
      • Workshop length, width and height<\/li>\n\n\n\n
      • Main production process<\/li>\n\n\n\n
      • Main heat sources<\/li>\n\n\n\n
      • Whether there is dust, smoke, oil mist or corrosive gas<\/li>\n\n\n\n
      • Possible fan installation positions<\/li>\n<\/ul>\n\n\n\n

        With this information, we can estimate the required airflow and recommend a suitable number of industrial exhaust fans.<\/p>\n\n\n\n

        For workshops with heavy heat, welding fumes, dust or chemical gases, the ventilation system should be designed according to the actual working conditions rather than using a simple ACH calculation alone.<\/p>\n\n\n\n

        Example summary:<\/strong>
        Workshop size: 60 \u00d7 30 \u00d7 6 m<\/strong>
        Workshop volume: 10,800 m\u00b3<\/strong>
        Reference air change rate: 6 ACH<\/strong>
        Required airflow: 64,800 m\u00b3\/h<\/strong>
        Fan airflow: 36,000 m\u00b3\/h each<\/strong>
        Recommended starting quantity: 2 fans<\/strong><\/p>","protected":false},"excerpt":{"rendered":"

        Not sure how many exhaust fans your factory needs? This article shows a simple way to estimate airflow using workshop size and air changes per hour, with a practical calculation example.<\/p>","protected":false},"author":1,"featured_media":943,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[63,62,61],"class_list":["post-941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-selection-applications","tag-factory-exhaust-fan","tag-factory-ventilation","tag-industrial-exhaust-fan"],"_links":{"self":[{"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/posts\/941","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/comments?post=941"}],"version-history":[{"count":1,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/posts\/941\/revisions"}],"predecessor-version":[{"id":944,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/posts\/941\/revisions\/944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/media\/943"}],"wp:attachment":[{"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/media?parent=941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/categories?post=941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nanzhimachinery.com\/ru\/wp-json\/wp\/v2\/tags?post=941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}