12" Diameter 5-Blade Fan | 25° Pitch, CCW, 5/16" Bore – Acme | NBK-21188

NBK-21188 – 12" Diameter, 5-Blade Fan, 25° Pitch, CCW, 5/16" Bore – Acme – Special Order

The NBK-21188 Fan Blade is a high-performance 12-inch replacement fan designed for HVAC and industrial ventilation applications. Featuring 5 blades, a 25-degree pitch, and a counterclockwise (CCW) rotation, this fan blade is engineered for efficient airflow and reduced vibration. It is a direct OEM-equivalent to Acme part number 31215 and includes a 5/16" bore for secure motor shaft mounting.

⚠️ SPECIAL ORDER NOTICE: This is a special order item sourced from NBK. Please allow 1–2 business days for processing.

Key Features

✅ Precision Design: 5-blade configuration with 25° pitch for balanced airflow and performance
✅ CCW Rotation: Counterclockwise operation for compatible motor systems
✅ OEM Replacement: Directly replaces Acme part 31215
✅ Standard Shaft Fit: 5/16" bore for common motor shaft sizes

Specifications

📌 SKU: 21188
📌 Category: HVAC / Fan Blades
📌 Diameter: 12 Inches
📌 Blade Count: 5
📌 Pitch: 25 Degrees
📌 Rotation: Counterclockwise (CCW)
📌 Bore Size: 5/16 Inch
📌 OEM Brand: Acme
📌 Replaces OEM Part: 31215

Equivalent To

Acme: 31215

Why Choose the NBK-21188?

The NBK-21188 is the ideal solution for replacing damaged or worn fan blades in your HVAC or ventilation system. With its optimized pitch and balanced blade design, this OEM-equivalent part ensures efficient air movement and long-term reliability for a wide range of industrial and residential fan applications.

Shipping & Availability

🚚 Special order from NBK. Please expect a 1–2 business day processing delay.