{"id":9111,"date":"2026-04-03T07:35:19","date_gmt":"2026-04-03T07:35:19","guid":{"rendered":"https:\/\/www.poultech.com\/?p=9111"},"modified":"2026-03-30T07:39:22","modified_gmt":"2026-03-30T07:39:22","slug":"chicken-house-fan-performance-and-inlet-area-calculation","status":"publish","type":"post","link":"https:\/\/www.poultech.com\/es\/chicken-house-fan-performance-and-inlet-area-calculation\/","title":{"rendered":"Chicken House Fan Performance and Inlet Area Calculation"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"9111\" class=\"elementor elementor-9111\">\n\t\t\t\t        <section class=\"elementor-section elementor-top-section elementor-element elementor-element-d796c77 elementor-section-boxed elementor-section-height-default elementor-section-height-default pxl-shape-divider-none\" data-id=\"d796c77\" data-element_type=\"section\">\n\n                \n                <div class=\"elementor-container elementor-column-gap-default\">\n                <div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-45e9e1d pxl-column-element-default\" data-id=\"45e9e1d\" data-element_type=\"column\">\r\n        <div class=\"elementor-widget-wrap elementor-element-populated\">\r\n                    \t\t<div class=\"elementor-element elementor-element-393afd1 elementor-widget elementor-widget-pxl_text_editor\" data-id=\"393afd1\" data-element_type=\"widget\" data-widget_type=\"pxl_text_editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"pxl_text_editor-393afd1-3924\" class=\"pxl-text-editor-wrap d-flex\" >\n\t<div class=\"pxl-text-editor elementor-clearfix\">\n        <p>In modern chicken farming, the design of the ventilation system directly affects the health of the flock and production efficiency. In recent years, an increasing number of traditional curtain-style chicken houses have been converted into tunnel-style ventilated chicken houses. However, many farmers have found that after the conversion, while the number of fans has increased and small air inlets have been added, the actual exhaust effect is far from what was expected.<\/p><p>This reveals a key issue: the matching of air intake area with fan performance. If the air intake area is insufficient, even adding more fans will not achieve the desired ventilation effect and may even lead to energy waste and equipment damage.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-178fccd pxl-heading-layout-1 elementor-widget elementor-widget-pxl_heading\" data-id=\"178fccd\" data-element_type=\"widget\" data-widget_type=\"pxl_heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"pxl-heading-wrap d-flex layout1\">\n    <div class=\"pxl-heading-inner\">\n        \n        <h4 class=\"heading-title\">\n            <span >\n                Insufficient air intake area leads to a precipitous drop in fan performance.            <\/span>\n                    <\/h4>\n\n            <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ede8663 elementor-widget elementor-widget-pxl_text_editor\" data-id=\"ede8663\" data-element_type=\"widget\" data-widget_type=\"pxl_text_editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"pxl_text_editor-ede8663-1583\" class=\"pxl-text-editor-wrap d-flex\" >\n\t<div class=\"pxl-text-editor elementor-clearfix\">\n        <p>Many professionals designing ventilation systems consider negative pressure, but often lack a precise understanding of the optimal fan size for a small window area.<\/p><p>If the air intake opening is too small, the fan will not operate smoothly, resulting in a significant performance decrease. Actual exhaust volume may drop by 30% or more. A simple analogy can help: The load on an exhaust fan is like sipping coffee through a thin straw. The more you try to sip it quickly, the harder it is to inhale. No matter how hard you try, you can&#8217;t finish it quickly. Using a wider straw, however, makes everything easier and more efficient.<\/p><p>Similarly, when a fan is forced to draw air in through a narrow intake, the efficiency of indoor and outdoor air exchange is greatly reduced, while power consumption increases significantly.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0ffc5d2 pxl-heading-layout-1 elementor-widget elementor-widget-pxl_heading\" data-id=\"0ffc5d2\" data-element_type=\"widget\" data-widget_type=\"pxl_heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"pxl-heading-wrap d-flex layout1\">\n    <div class=\"pxl-heading-inner\">\n        \n        <h4 class=\"heading-title\">\n            <span >\n                Airflow velocity is a key indicator            <\/span>\n                    <\/h4>\n\n            <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-850f3e3 elementor-widget elementor-widget-pxl_text_editor\" data-id=\"850f3e3\" data-element_type=\"widget\" data-widget_type=\"pxl_text_editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"pxl_text_editor-850f3e3-9008\" class=\"pxl-text-editor-wrap d-flex\" >\n\t<div class=\"pxl-text-editor elementor-clearfix\">\n        <p>The speed at which air passes through the air inlet depends on the size of the fan and the number of inlets. The smaller the opening, the higher the airflow velocity.<\/p><p>Based on practical experience: Sidewall inlets: Exhaust fan operation is largely unaffected when the airflow velocity is controlled below 900 feet per minute (approximately 4.5 meters per second).<\/p><p>Once an attempt is made to increase the airflow velocity above 900 feet per minute, fan performance will significantly decrease.<\/p><p>Different inlet types have different maximum permissible airflow velocities: Inlets with shades or tunnel ventilation inlets: Airflow velocity should not exceed 500 feet per minute (approximately 2.54 meters per second).<\/p><p>4-inch (10-centimeter) water curtains: Airflow velocity needs to be controlled below 300 feet per minute (approximately 1.52 meters per second), otherwise flow resistance will increase dramatically.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fad8223 pxl-heading-layout-1 elementor-widget elementor-widget-pxl_heading\" data-id=\"fad8223\" data-element_type=\"widget\" data-widget_type=\"pxl_heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"pxl-heading-wrap d-flex layout1\">\n    <div class=\"pxl-heading-inner\">\n        \n        <h4 class=\"heading-title\">\n            <span >\n                Real-world data shows you: More air inlets mean higher fan efficiency            <\/span>\n                    <\/h4>\n\n            <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7b0503 elementor-widget elementor-widget-image\" data-id=\"c7b0503\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"759\" height=\"58\" src=\"https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112707_073.png\" class=\"attachment-full size-full wp-image-9103\" alt=\"\" srcset=\"https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112707_073.png 759w, https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112707_073-300x23.png 300w, https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112707_073-18x1.png 18w\" sizes=\"(max-width: 759px) 100vw, 759px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e3f5ad elementor-widget elementor-widget-image\" data-id=\"6e3f5ad\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"714\" height=\"66\" src=\"https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112701_249.png\" class=\"attachment-full size-full wp-image-9102\" alt=\"\" srcset=\"https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112701_249.png 714w, https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112701_249-300x28.png 300w, https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112701_249-18x2.png 18w\" sizes=\"(max-width: 714px) 100vw, 714px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-66dcaa2 elementor-widget elementor-widget-pxl_text_editor\" data-id=\"66dcaa2\" data-element_type=\"widget\" data-widget_type=\"pxl_text_editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"pxl_text_editor-66dcaa2-4841\" class=\"pxl-text-editor-wrap d-flex\" >\n\t<div class=\"pxl-text-editor elementor-clearfix\">\n        <p>In actual testing, using a 48-inch (1.2-meter) fan for comparison, the results are very clear:<br \/>With the same air inlet area, as the number of fans increases, the exhaust volume of a single fan begins to decrease once the intake velocity exceeds 900 feet per minute.<\/p><p>To achieve an exhaust volume of 80,000 cubic feet per minute:<br \/>With insufficient air inlet area, 6 fans are needed to barely achieve this.<\/p><p>By increasing the number of air inlets, only 4 fans are needed to easily achieve the same exhaust volume.<\/p><p>This data clearly demonstrates that increasing the number of air inlets not only improves ventilation efficiency but also reduces the number of fans, lowering equipment investment and operating costs.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1a447dd pxl-heading-layout-1 elementor-widget elementor-widget-pxl_heading\" data-id=\"1a447dd\" data-element_type=\"widget\" data-widget_type=\"pxl_heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"pxl-heading-wrap d-flex layout1\">\n    <div class=\"pxl-heading-inner\">\n        \n        <h4 class=\"heading-title\">\n            <span >\n                Why is the wind speed at small windows calculated at 4.5 m\/s?            <\/span>\n                    <\/h4>\n\n            <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-91e9523 elementor-widget elementor-widget-image\" data-id=\"91e9523\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"651\" height=\"460\" src=\"https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112727_465.png\" class=\"attachment-full size-full wp-image-9104\" alt=\"\" srcset=\"https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112727_465.png 651w, https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112727_465-300x212.png 300w, https:\/\/www.poultech.com\/wp-content\/uploads\/2026\/03\/\u5fae\u4fe1\u56fe\u7247_2026-03-30_112727_465-18x12.png 18w\" sizes=\"(max-width: 651px) 100vw, 651px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4c59988 elementor-widget elementor-widget-pxl_text_editor\" data-id=\"4c59988\" data-element_type=\"widget\" data-widget_type=\"pxl_text_editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"pxl_text_editor-4c59988-5958\" class=\"pxl-text-editor-wrap d-flex\" >\n\t<div class=\"pxl-text-editor elementor-clearfix\">\n        <p>This article also explains a common design standard in the industry: the wind speed at small windows is often calculated at 4.5 m\/s (approximately 900 feet per minute). The principle behind this is based on the matching relationship between fan performance and air intake velocity\u2014exceeding this value will subject the fan to additional load, and its performance will begin to decline.<\/p><p>At the same time, it clearly explains why the air velocity through the evaporative cooling pad is unlikely to exceed 2 m\/s, and the actual impact of the shading on the air intake. These details are crucial points that cannot be ignored in the design of efficient chicken house ventilation.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3750fbb pxl-heading-layout-1 elementor-widget elementor-widget-pxl_heading\" data-id=\"3750fbb\" data-element_type=\"widget\" data-widget_type=\"pxl_heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"pxl-heading-wrap d-flex layout1\">\n    <div class=\"pxl-heading-inner\">\n        \n        <h4 class=\"heading-title\">\n            <span >\n                Avoid High-Resistance Ventilation for Energy Efficiency            <\/span>\n                    <\/h4>\n\n            <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04b3d07 elementor-widget elementor-widget-pxl_text_editor\" data-id=\"04b3d07\" data-element_type=\"widget\" data-widget_type=\"pxl_text_editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"pxl_text_editor-04b3d07-9962\" class=\"pxl-text-editor-wrap d-flex\" >\n\t<div class=\"pxl-text-editor elementor-clearfix\">\n        <p>When designing and modifying chicken house ventilation systems, it is crucial to ensure the proper matching of air intake area and the number of fans. Insufficient air intake area \u2192 excessively high wind speed \u2192 increased fan load \u2192 decreased exhaust volume \u2192 increased energy consumption \u2192 shortened equipment lifespan\u2014this is a chain reaction.<\/p><p>By minimizing high-resistance ventilation and rationally configuring the number and area of \u200b\u200bair inlets, each fan can achieve its intended efficiency, resulting in a highly efficient, energy-saving, and stable chicken house environment.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t                    <\/div>\r\n        <\/div>\r\n        \t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>In modern chicken farming, the design of the ventilation system directly affects the health of the flock and production efficiency. In recent years, an increasing number of traditional curtain-style chicken houses have been converted into tunnel-style ventilated chicken houses. However, many farmers have found that after the conversion, while the number of fans has increased [&hellip;]<\/p>","protected":false},"author":1,"featured_media":9120,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[],"class_list":["post-9111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chicken House Fan Performance and Inlet Area Calculation<\/title>\n<meta name=\"description\" content=\"In modern chicken farming, the design of the ventilation system directly affects the health of the flock and production efficiency. 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