Modine 5H0798020000 Fan Blade 323613-751 The System Sensor D4S is

The System Sensor D4S is a 4-wire photoelectric duct smoke detector sensor component designed specifically for integration with the D4120 duct smoke detector housing

a different expansion interface is required to ensure proper communication and safety logic

As a direct-fit successor to the 62-42506-01

If your burner fails to stay lit or the pilot drops out under load

Modine 5H0798020000 Fan Blade 323613-751 The System Sensor D4S isThe Modine 5H0798020000 Fan Blade is a critical OEM replacement part engineered for high performance service in Modine unit heaters and HVAC systems. This heavy duty 18 inch diameter fan blade features a 3 blade configuration and a 1 2 inch bore, designed to meet exact factory RPM specifications and balance requirements. In the field, using an authentic Modine 5H0798020000 ensures that the motor remains within its design amp draw and static pressure