This L290F reset thermal switch operates as a secondary high-limit safety

12" insertion length

Excessive heat cycles from poor airflow can cause the internal bimetal disc to lose calibration or the contacts to pit over time

Industrial Durability: Molded from impact-resistant plastic to withstand the rigors of mechanical rooms and industrial hallways

As an official part from Nortek Global HVAC

Reznor 68005 Fan Blade This L290F reset thermal switchThe Reznor 68005 is a critical OEM replacement fan blade designed specifically for Reznor HVAC equipment, including FT and SFT series unit heaters. This component features a 2 inch diameter with a 10 blade configuration, engineered to maintain the precise static pressure required for optimal combustion and venting. With a 1 4" bore and clockwise (CW rotation) orientation, it serves as a direct fit solution for venter motor assemblies, ensuring