{"id":46,"date":"2026-07-26T16:47:07","date_gmt":"2026-07-26T16:47:07","guid":{"rendered":"https:\/\/nanzhimachinery.com\/?post_type=product&p=46"},"modified":"2026-07-26T16:47:07","modified_gmt":"2026-07-26T16:47:07","slug":"axial-flow-roof-fan","status":"publish","type":"product","link":"https:\/\/nanzhimachinery.com\/zh\/product\/axial-flow-roof-fan\/","title":{"rendered":"Axial-flow roof fan"},"content":{"rendered":"

Axial Flow Roof Fan \u2013 Product Introduction<\/p>\n

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  1. Product Overview<\/b><\/strong><\/li>\n<\/ol>\n

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    The axial flow roof fan (typical model: DWT-I) is a ventilation device installed on building rooftops. Its airflow direction is parallel to the blade axis, offering high air volume with moderate static pressure. This fan series features a molded axial-flow impeller and a dedicated motor with direct drive. The complete unit mainly consists of the impeller, fan casing, cowl, transmission components, hinged dampers, bird screens, safety nets, and other parts.<\/p>\n

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    1. Core Features<\/b><\/strong><\/li>\n<\/ol>\n

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      1. High air volume, moderate pressure<\/li>\n<\/ol>\n

        The axial flow roof fan delivers high airflow with lower pressure compared to centrifugal fans, making it suitable for applications with short or no ductwork and direct exhaust.<\/p>\n

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        1. Low noise operation<\/li>\n<\/ol>\n

          With wide blades, large chord length, spatially twisted and inclined blade profiles, and CAD multi-objective optimization, the fan achieves the required airflow and pressure at low rotational speeds, effectively reducing noise.<\/p>\n

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          1. Lightweight, high strength, and corrosion resistance<\/li>\n<\/ol>\n

            Key components such as the casing and cowl can be manufactured from FRP (fiber-reinforced plastic), offering corrosion resistance, aging resistance, and light weight. Depending on the corrosiveness of the medium, the impeller can be made of ABS (engineering plastic), FRP, or aluminum alloy.<\/p>\n

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            1. Smooth operation and long service life<\/li>\n<\/ol>\n

              Low moment of inertia and high dynamic balance accuracy ensure stable long\u2011term performance, exceeding industry standards.<\/p>\n

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              1. Bidirectional reversible function<\/li>\n<\/ol>\n

                Upon request, the fan can be designed for reversible operation, providing equivalent performance in both forward and reverse directions, enabling dual-purpose supply and exhaust ventilation.<\/p>\n

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                1. Attractive appearance<\/li>\n<\/ol>\n

                  The cowl is made of FRP with smooth curved surfaces. Alternatively, it can be manufactured from steel with galvanized and powder\u2011coated finish per customer requirements.<\/p>\n

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                  1. Application Scenarios<\/b><\/strong><\/li>\n<\/ol>\n

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                    Axial flow roof fans are widely used in the following fields:<\/p>\n

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                    – Industrial plants: ventilation and exhaust in power plants, chemical plants, rubber factories, machinery manufacturing, metallurgy, paper mills, etc.<\/p>\n

                    – Commercial buildings: air exchange in shopping malls, gymnasiums, cinemas, underground parking garages, and other crowded spaces.<\/p>\n

                    – Warehousing and logistics: forced exhaust and heat dissipation in warehouses and distribution centers.<\/p>\n

                    – Agriculture: ventilation, temperature and humidity control in farms and greenhouses.<\/p>\n

                    – Special environments: available in corrosion\u2011resistant versions (for chemical, electroplating, wastewater treatment, and other corrosive environments) or explosion\u2011proof versions (for flammable and explosive locations).<\/p>\n

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                    1. Installation Essentials<\/b><\/strong><\/li>\n<\/ol>\n

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                      1. Foundation preparation: Before installation, prepare a concrete foundation on the roof with embedded anchor bolts; the centerline deviation shall not exceed 10 mm.<\/li>\n
                      2. Vibration isolation: Place rubber vibration\u2011isolating pads with a thickness of no less than 6 mm between the foundation and the fan base.<\/li>\n
                      3. Vertical installation: The fan must be installed vertically, with a levelness deviation not exceeding 1\/1000.<\/li>\n
                      4. Clearance adjustment: The radial and axial clearances between the impeller and the casing must be uniform and comply with the technical documentation.<\/li>\n
                      5. Motor protection: For outdoor rooftop installation, an IP55\u2011rated motor must be used.<\/li>\n<\/ol>\n

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                        1. Selection Considerations<\/b><\/strong><\/li>\n<\/ol>\n

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                          1. Calculate air volume: Required air volume = space volume \u00d7 air changes per hour (typical workshops: 6\u201310 changes\/hour).<\/li>\n
                          2. Determine static pressure: Estimate system resistance based on duct length, number of bends, etc. Choose axial flow for low resistance; choose centrifugal for higher resistance (>300 Pa).<\/li>\n
                          3. Material selection: For ordinary air, use carbon steel \/ galvanized steel; for corrosive gases, use FRP or 304 stainless steel.<\/li>\n
                          4. Explosion\u2011proof requirements: In flammable and explosive areas, an explosion\u2011proof motor (Exd II BT4 grade) must be used and carry CCC explosion\u2011proof certification.<\/li>\n
                          5. Fire protection needs: For smoke exhaust in fire scenarios, select a fan with CCCF certification specifically designed for fire protection.<\/li>\n<\/ol>\n

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                             <\/p>","protected":false},"excerpt":{"rendered":"

                            Axial Flow Roof Fan \u2013 Product Introduction   Product Overview   The axial flow roof fan (typical model: DWT-I) is a ventilation device installed on building rooftops. Its airflow direction is parallel to the blade axis, offering high air volume with moderate static pressure. This fan series features a molded axial-flow impeller and a dedicated […]<\/p>\n","protected":false},"featured_media":48,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[16],"product_tag":[],"class_list":["post-46","product","type-product","status-publish","has-post-thumbnail","product_cat-bv","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/product\/46","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/comments?post=46"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/media\/48"}],"wp:attachment":[{"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/media?parent=46"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/product_brand?post=46"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/product_cat?post=46"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/nanzhimachinery.com\/zh\/wp-json\/wp\/v2\/product_tag?post=46"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}