F cut-out threshold provides essential protection for the internal heat exchanger

Engineered with a round metal casing and a durable thermoplastic top

verifying the specific model number is recommended for the best seal

Step-opening valves require a different regulation profile

If the switch has tripped

Lennox 12K48 Orifice F cut-out threshold provides essentialThe Lennox 12K48 LP Burner Orifice is a critical component for maintaining precise manifold pressure in Lennox furnace LP conversion kits. Engineered with a specific drill size calibrated for Propane (Liquid Petroleum) applications, this brass burner orifice ensures the correct air to fuel ratio demanded by high efficiency heating systems. Whether you are performing a seasonal tune up or a full field conversion, using OEM Lennox replacement parts is