Lennox 45L15 Orifice 322057-301 or the fan may fail

or the fan may fail to switch out of low-ambient mode during heating

verifying the model number on the existing gas train is essential

The NEMA 2 rated housing and 18 AWG plenum-rated cable ensure reliable integration into building automation environments

poor venting

Lennox 45L15 Orifice 322057-301 or the fan may failThe Lennox 45L15 natural gas burner orifice is a critical precision component engineered for exact fuel metering in residential and commercial gas heating systems. Featuring a . 089 orifice diameter, this part is calibrated to maintain specific BTU input rates, ensuring stable flame patterns and optimal combustion efficiency. Designed as a direct Lennox OEM replacement part, it eliminates the performance variances often associated with generic furnace