{"id":20628,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/axial-fan-defects\/"},"modified":"2026-05-23T22:44:50","modified_gmt":"2026-05-23T22:44:50","slug":"axial-fan-defects","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/mr\/glossary\/axial-fan-defects\/","title":{"rendered":"What are Axial Fan Defects? Blade and Flow Problems"},"content":{"rendered":"<h1>Understanding Axial Fan Defects<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A full kit portable balancer and vibration analyzer\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">Portable balancer &#038; Vibration analyzer Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,975.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" title=\"Vibration sensor\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A vibration sensor close-up\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" title=\"Vibration sensor\">Vibration sensor<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>90.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Optical Sensor (Laser Tachometer)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">Optical Sensor (Laser Tachometer)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>124.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>6,803.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" title=\"Magnetic Stand Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnet base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a 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https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamic balancer \u201cBalanset-1A\u201d OEM\">Dynamic balancer \u201cBalanset-1A\u201d OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,735.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/20628?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"Add to cart: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>Axial fan defects<\/strong> are the faults specific to axial-flow fans, in which air moves parallel to the shaft axis through a propeller-like <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/rotor\/\">rotor<\/a>. They include blade pitch-angle errors, tip-clearance degradation, blade <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/fatigue\/\">fatigue<\/a> and cracking, hub-attachment failures, rotating stall, and aerodynamic resonances. Axial fans differ from centrifugal fans in their flow path and force distribution, which exposes them to unique failure modes tied to blade twist, tip-leakage flow, and varying axial thrust. They sit within the wider family of <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/fan-defects\/\">fan defects<\/a> but demand their own diagnostic approach.<\/p>\n<p>Axial fans are everywhere in HVAC systems, cooling towers, power-plant draft fans, and industrial ventilation. Their large diameter and relatively lightweight blades make them especially prone to vibration-induced fatigue and to aerodynamic instabilities \u2014 problems that show up clearly in a <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/vibration-analysis\/\">vibration analysis<\/a> survey when you know what signatures to look for.<\/p>\n<h2>1. Blade Pitch and Angle Issues<\/h2>\n<h3>Incorrect Pitch Setting<\/h3>\n<ul>\n<li><strong>Adjustable-pitch fans:<\/strong> the blade angle is adjustable to tune performance.<\/li>\n<li><strong>Misadjustment:<\/strong> blades set to the wrong angle for the operating conditions.<\/li>\n<li><strong>Effects:<\/strong> poor performance, high vibration, and a tendency to stall.<\/li>\n<li><strong>Non-uniform setting:<\/strong> blades sitting at different angles distribute mass and aerodynamic load unevenly, creating <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/unbalance\/\">unbalance<\/a>.<\/li>\n<\/ul>\n<h3>Blade Twist Deformation<\/h3>\n<ul>\n<li>Blades permanently twisted by aerodynamic or centrifugal loads.<\/li>\n<li>Altered flow angles, which degrade performance.<\/li>\n<li>Asymmetric twist that creates unbalance.<\/li>\n<li>Thermal distortion driven by temperature gradients across the rotor.<\/li>\n<\/ul>\n<h2>2. Tip Clearance Problems<\/h2>\n<h3>Why Tip Clearance Is Critical in Axial Fans<\/h3>\n<ul>\n<li>Flow leaks over the blade tips, forming tip vortices.<\/li>\n<li>Efficiency is very sensitive to tip clearance.<\/li>\n<li>Each 1% increase in clearance loses roughly 1&ndash;2% efficiency.<\/li>\n<li>Clearance also affects vibration and acoustic performance.<\/li>\n<\/ul>\n<h3>Excessive Clearance<\/h3>\n<ul>\n<li><strong>Causes:<\/strong> <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/wear\/\">wear<\/a>, housing distortion, blade deflection, and thermal growth.<\/li>\n<li><strong>Effects:<\/strong> performance loss, stronger tip vortices, and increased vibration.<\/li>\n<li><strong>Typical new clearance:<\/strong> 0.5&ndash;1.5% of blade span.<\/li>\n<li><strong>Action needed:<\/strong> more than 3% of span indicates the fan needs replacement or rebuild.<\/li>\n<\/ul>\n<h3>Tip Rubs<\/h3>\n<ul>\n<li>Blade tips contacting the housing.<\/li>\n<li>Caused by excessive <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/vibration\/\">vibration<\/a>, thermal growth, or <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/misalignment\/\">misalignment<\/a>.<\/li>\n<li>Generates noise, vibration, and blade damage \u2014 a localised form of <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/rotor-rub\/\">rotor rub<\/a>.<\/li>\n<li>Leaves wear marks visible on both the blade tips and the housing.<\/li>\n<\/ul>\n<h2>3. Blade Structural Defects<\/h2>\n<h3>Fatigue Cracks<\/h3>\n<ul>\n<li><strong>Location:<\/strong> the blade root (where it attaches to the hub) and the leading edge.<\/li>\n<li><strong>Cause:<\/strong> alternating aerodynamic loads, vibration, and <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/blade-resonance\/\">blade resonance<\/a>.<\/li>\n<li><strong>Detection:<\/strong> dye penetrant, magnetic particle, or ultrasonic <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/non-destructive-testing\/\">non-destructive testing<\/a>.<\/li>\n<li><strong>Criticality:<\/strong> if undetected, a fatigue crack can progress to blade liberation \u2014 the throwing of a whole blade.<\/li>\n<\/ul>\n<h3>Blade Attachment Failures<\/h3>\n<ul>\n<li>Welds cracking at the blade-to-hub junction.<\/li>\n<li>Bolted attachments working loose.<\/li>\n<li>Root fillet cracks.<\/li>\n<li>Progressive failure if the condition is not caught early.<\/li>\n<\/ul>\n<h2>4. Aerodynamic Instabilities<\/h2>\n<h3>Rotating Stall<\/h3>\n<ul>\n<li>Flow separation that forms on some blades and rotates around the annulus.<\/li>\n<li>Produces <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/sub-synchronous\/\">sub-synchronous<\/a> vibration at 0.2&ndash;0.5&times; rotor speed.<\/li>\n<li>Occurs at low flow or under high inlet resistance.<\/li>\n<li>Can be violent and damaging to the blades.<\/li>\n<\/ul>\n<h3>Flutter<\/h3>\n<ul>\n<li>Self-excited blade vibration arising from aeroelastic coupling \u2014 a form of <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/self-excited-vibration\/\">self-excited vibration<\/a>.<\/li>\n<li>Blade motion changes the airflow, and the airflow in turn drives the blade motion.<\/li>\n<li>Occurs at the blade&#8217;s <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/natural-frequency\/\">natural frequency<\/a>.<\/li>\n<li>Can cause rapid blade failure.<\/li>\n<li>Rare, but catastrophic when it happens.<\/li>\n<\/ul>\n<h2>5. Vibration Signatures<\/h2>\n<h3>Blade Passing Frequency<\/h3>\n<ul>\n<li><strong>Calculation:<\/strong> BPF = number of blades &times; RPM \/ 60. You can work this out instantly with the <a href=\"https:\/\/vibromera.eu\/mr\/calculators\/blade-pass-frequency\/\">Blade Pass Frequency Calculator<\/a>.<\/li>\n<li><strong>Axial fans:<\/strong> the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/blade-passing-frequency\/\">blade passing frequency<\/a> is often prominent \u2014 more so than in centrifugal fans.<\/li>\n<li><strong>Elevated amplitude:<\/strong> points to tip-clearance issues, blade damage, or flow problems.<\/li>\n<li><strong>Harmonics:<\/strong> multiple BPF <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/harmonics\/\">harmonics<\/a> indicate blade or flow problems.<\/li>\n<\/ul>\n<h3>Unbalance<\/h3>\n<ul>\n<li>Arises from blade buildup, erosion, or pitch-angle non-uniformity.<\/li>\n<li>Shows up as a 1&times; running-speed component.<\/li>\n<li>Correctable by <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/field-balancing\/\">field balancing<\/a> with blade-mounted weights.<\/li>\n<\/ul>\n<h3>Stall-Related Vibration<\/h3>\n<ul>\n<li>Sub-synchronous components in the 0.2&ndash;0.5&times; range.<\/li>\n<li>Random, fluctuating amplitude.<\/li>\n<li>An increase in broadband noise.<\/li>\n<li>Disappears once flow is increased \u2014 a useful confirming test.<\/li>\n<\/ul>\n<h2>6. Detection and Monitoring<\/h2>\n<h3>Vibration Analysis<\/h3>\n<ul>\n<li>Standard bearing vibration monitoring.<\/li>\n<li>Trending of BPF amplitude over time.<\/li>\n<li>Watching for sub-synchronous components that signal stall.<\/li>\n<li><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/axial-vibration\/\">Axial vibration<\/a> measurement to catch thrust variations.<\/li>\n<\/ul>\n<h3>Performance Monitoring<\/h3>\n<ul>\n<li>Airflow measurement by the pressure-differential method.<\/li>\n<li>Power-consumption trending.<\/li>\n<li>Efficiency calculation.<\/li>\n<li>Comparison against design or <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/baseline\/\">baseline<\/a> performance.<\/li>\n<\/ul>\n<h3>Inspection<\/h3>\n<ul>\n<li>Visual blade inspection for cracks, erosion, and <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/corrosion\/\">corrosion<\/a>.<\/li>\n<li>Blade pitch-angle verification.<\/li>\n<li>Tip-clearance measurement.<\/li>\n<li>Hub and attachment-point inspection.<\/li>\n<li>NDT for crack detection in critical fans.<\/li>\n<\/ul>\n<h2>7. Field Balancing and Vibration Limits<\/h2>\n<p>Because an axial fan runs in its own bearings, the practical way to deal with the dominant 1&times; unbalance is to balance it in place rather than remove the rotor. A portable two-channel analyser such as the <a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\">Balanset-1A<\/a> measures the 1&times; <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/phase\/\">amplitude and phase<\/a> at operating speed, computes the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/influence-coefficient\/\">influence coefficients<\/a> of the fan, and tells you the mass and angle of the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/correction-weight\/\">correction weight<\/a> to add at the blades. It then verifies the result against the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/residual-unbalance\/\">residual unbalance<\/a> tolerance. For acceptance and balance-quality grades, large industrial fans are addressed specifically by <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/iso-14694\/\">ISO 14694<\/a>, while overall vibration severity on the bearing housings is judged against the modern <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/iso-20816-3\/\">ISO 20816-3<\/a> (the standard that superseded ISO 10816-3).<\/p>\n<h2>8. Maintenance and Correction<\/h2>\n<h3>Blade Maintenance<\/h3>\n<ul>\n<li>Clean buildup from the blades, then rebalance.<\/li>\n<li>Repair minor erosion and corrosion damage.<\/li>\n<li>Replace cracked or severely damaged blades.<\/li>\n<li>Verify that all blades sit at the same pitch angle.<\/li>\n<li>Check and tighten the blade-attachment bolts.<\/li>\n<\/ul>\n<h3>Clearance Restoration<\/h3>\n<ul>\n<li>Add shroud rings or tip seals where clearance is excessive.<\/li>\n<li>Rebuild the housing to reduce its diameter.<\/li>\n<li>Replace the fan if that is economically justified.<\/li>\n<\/ul>\n<h3>Operating Point Control<\/h3>\n<ul>\n<li>Adjust system resistance so the fan operates near its design point.<\/li>\n<li>Use variable-speed control for optimal matching.<\/li>\n<li>Avoid operation in the stall region.<\/li>\n<li>Use inlet-vane or damper control for turndown.<\/li>\n<\/ul>\n<p>Axial fan defects combine the standard problems of rotating machinery with aerodynamic phenomena unique to axial-flow machines. Understanding blade structural issues, the criticality of tip clearance, and instabilities such as rotating stall \u2014 paired with appropriate vibration monitoring and performance testing \u2014 keeps these essential air-moving machines running reliably in industrial service.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about axial fan defects including blade damage, tip clearance issues, stall, and aerodynamic instabilities specific to axial flow fan designs.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,110],"tags":[],"class_list":["post-20628","glossary","type-glossary","status-publish","hentry","category-glossary","category-vibration-diagnostics"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/20628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/20628\/revisions"}],"predecessor-version":[{"id":101351,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/20628\/revisions\/101351"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/media?parent=20628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/categories?post=20628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/tags?post=20628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}