The Nordyne 901839 Combustion Chamber is a critical replacement component engineered specifically for Miller and Intertherm gas-fired furnaces

Does this kit include the sealing O-ring

Optimized Compatibility: Verified for use with 1–3 ton Source 1 and York systems

the system continuously monitors duct pressure

There is no functional or technical difference between these two model numbers

Laars Heating Systems R2076600 Pressure Switch 328140-751 The Nordyne 901839 Combustion ChamberThe Laars Heating Systems R2076600 Pressure Switch is a critical safety and operational component designed for high efficiency hydronic systems, specifically the Laars Pennant and Mighty Therm II series. Calibrated at 1. 05" WC (Water Column), this PR V pressure switch serves as a blower proving mechanism, ensuring that the combustion fan is generating sufficient airflow before the ignition sequence initiates. For contractors servicing commercial