Lennox 19F79 (105982-17) 

 

Lennox 19F79 (105982-17) is a genuine OEM high-altitude pressure switch kit designed to maintain safe and reliable furnace operation in elevated locations. Engineered to actuate at 0.80 inches W.C. and marked with a fuchsia identification dot, this switch ensures proper airflow monitoring, ignition sequencing, and combustion safety when standard switches cannot compensate for reduced air density. Ideal for Lennox gas furnaces installed in high-altitude regions, it helps prevent nuisance lockouts, short cycling, or flame rollout conditions.  

 

Key features:

• OEM Lennox 19F79 / 105982-17 replacement
• High-altitude application pressure switch kit
• Actuation set point: 0.80" W.C.
• Fuchsia dot identification for correct system matching
• Supports proper draft, airflow, and combustion safety
• Helps restore furnace reliability and performance in elevated environments

Suitable for residential and light commercial Lennox heating systems requiring a high-altitude pressure specification. Always verify compatibility with the unit model and installation elevation before replacement.