Lennox 25W78 Insert 320074-702 Universal switches often lack the

Universal switches often lack the exact set point calibration (inches WC) required for safe combustion

Prioritizing the structural integrity of the fan shroud is essential for long-term HVAC maintenance

Key Benefits High Amperage Rating: Supports up to 25 amps

Can this be used in systems converted to R-134a

Lennox 25W78 Insert 320074-702 Universal switches often lack theThe Lennox 25W78 NOx Insert is a critical combustion component engineered specifically for Lennox gas furnaces to reduce nitrogen oxide emissions. Designed for high efficiency heating systems, this OEM Lennox replacement part ensures that the burner assembly maintains optimal fuel to air ratios for a cleaner, more environmentally compliant burn. Constructed from heavy duty steel to withstand high temperature furnace environments, the 25W78 insert