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25-inch female NPT inlet and outlet
including Direct Spark Ignition (DSI) and Hot Surface Ignition (HSI) systems
always verify your specific model number compatibility before up-sizing
and venting applications
Lennox 25W78 Insert R-410A 25-inch female NPT inlet andThe 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
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