{"product_id":"21188","title":"12\" Diameter | 5-Blade Fan | 25° Pitch | CCW Rotation | 5\/16\" Bore | NBK-21188","description":"\u003ch3\u003e\u003cstrong\u003eNBK-21188 – 12\" Diameter | 5-Blade Fan | 25° Pitch | CCW Rotation | 5\/16\" Bore | OEM Replacement for Acme 31215\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eNBK-21188 Fan Blade\u003c\/strong\u003e is a high-performance 12-inch replacement fan designed for HVAC and industrial ventilation systems. With its \u003cstrong\u003e5-blade configuration\u003c\/strong\u003e, \u003cstrong\u003e25° pitch\u003c\/strong\u003e, and \u003cstrong\u003ecounterclockwise (CCW) rotation\u003c\/strong\u003e, this fan blade ensures efficient airflow and reduced vibration. It serves as a direct OEM-equivalent replacement for \u003cstrong\u003eAcme part number 31215\u003c\/strong\u003e and includes a \u003cstrong\u003e5\/16\" bore\u003c\/strong\u003e for secure motor shaft mounting.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Design\u003c\/strong\u003e – 5-blade, 25° pitch configuration for balanced airflow and optimal performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCCW Rotation\u003c\/strong\u003e – Counterclockwise operation compatible with standard ventilation motors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Replacement\u003c\/strong\u003e – Directly replaces Acme part #31215\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Shaft Fit\u003c\/strong\u003e – 5\/16\" bore for common motor shaft sizes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 21188\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e HVAC \/ Fan Blades\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 12\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlade Count:\u003c\/strong\u003e 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitch:\u003c\/strong\u003e 25°\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotation:\u003c\/strong\u003e Counterclockwise (CCW)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 5\/16\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Brand:\u003c\/strong\u003e Acme\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces OEM Part:\u003c\/strong\u003e 31215\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eEquivalent To:\u003c\/strong\u003e\u003c\/h2\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eAcme:\u003c\/strong\u003e 31215\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003e\u003cstrong\u003eWhy Choose the NBK-21188?\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe NBK-21188 is an ideal solution for replacing worn or damaged fan blades in HVAC and ventilation systems. Its balanced design and precise pitch ensure efficient airflow, reduced noise, and long-term reliability for both residential and industrial applications.\u003c\/p\u003e\u003ch2\u003e\u003cstrong\u003eShipping \u0026amp; Availability:\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eSpecial order from NBK. Please allow 1–2 business days for processing.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Acme","offers":[{"title":"Default Title","offer_id":56929327087956,"sku":"SO-21188","price":35.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7698\/5940\/files\/21188-31215_5c872286-44c3-42e8-acdb-0f5e89d97469.webp?v=1787841586","url":"https:\/\/total-hearth.shop\/products\/21188","provider":"total-hearth.shop","version":"1.0","type":"link"}