Reznor UNT1803-31LG-CTN 18-Inch 3-Blade Replacement Fan Propeller

The Reznor UNT1803-31LG-CTN is an 18-inch diameter replacement fan blade designed for Reznor unit heaters and HVAC equipment. This three-blade aluminum propeller features a 31-degree pitch angle optimized for efficient airflow and heat distribution in commercial and industrial heating applications.

Key Specifications:

• 18-inch diameter aluminum propeller
• 3-blade configuration for balanced airflow
• 31-degree pitch angle for optimal performance
• 1/2-inch bore hub for secure motor shaft mounting
• Counter-clockwise (CCW) rotation
• Heavy-duty aluminum construction for durability

This OEM replacement fan blade is engineered to restore proper airflow and performance to Reznor unit heaters. The 31-degree pitch provides an ideal balance between air volume and static pressure, making it suitable for various heating system configurations. The aluminum construction ensures long-lasting performance while maintaining lightweight operation for reduced motor strain.