While the open frame design is versatile

and A2L compliant

providing a direct-fit solution for technicians servicing Lennox GCS16 and GCS20 series units

HK06NC001 is the direct replacement for HK06WC025

Using a blade with a different pitch than the specified 23 degrees can result in inadequate airflow or motor burnout

Robertshaw 780-787 Ignition Module 30067439-890 While the open frame designThe Robertshaw 780 787 Ignition Module is a professional grade Hot Surface Ignition (HSI) Control engineered for high reliability performance in gas fired heating systems. This specific unit is a direct replacement for the HS780 34NR 306A, maintaining exact electrical and mechanical specifications for seamless field installation. Operating on a 120V AC supply voltage with a 24V AC control input, this module features a 34 second ignitor warm up period