The Nordyne 667354R Four-blade fan is a high-performance fan that is designed to provide efficient air circulation in a number of HVAC systems. This fan has an 18-inch diameter and 4 blades, thereby providing sufficient airflow to ensure maximum indoor comfort. This fan with a 1/2" bore is simple to install because it uses conventional motor shafts. The air moves more easily and quiet... https://www.partshnc.com/667354r-nordyne-18-dia-33deg-12-cw-4bld-fan