12″ Diameter

NBK-21188 – 12″ Diameter | 5-Blade Fan | 25° Pitch | CCW Rotation | 5/16″ Bore | OEM Replacement for Acme 31215The NBK-21188 Fan Blade is a high-performance 12-inch replacement fan designed for HVAC and industrial ventilation systems. With its 5-blade configuration, 25° pitch, and counterclockwise (CCW) rotation, this fan blade ensures efficient airflow and reduced vibration. It serves as a direct OEM-equivalent replacement for Acme part number 31215 and includes a 5/16″ bore for secure motor shaft mounting.Key Features:Precision Design – 5-blade, 25° pitch configuration for balanced airflow and optimal performanceCCW Rotation – Counterclockwise operation compatible with standard ventilation motorsOEM Replacement – Directly replaces Acme part 31215Standard Shaft Fit – 5/16″ bore for common motor shaft sizesSpecifications:SKU: 21188Category: HVAC / Fan BladesDiameter: 12″Blade Count: 5Pitch: 25°Rotation: Counterclockwise (CCW)Bore Size: 5/16″OEM Brand: AcmeReplaces OEM Part: 31215Equivalent To:Acme: 31215Why Choose the NBK-21188?The 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.Shipping & Availability:Special order from NBK. Please allow 1–2 business days for processing.