Precise Combustion Control: Includes a high-tension spring designed to regulate the higher manifold pressures required for propane

This is a clear sign the unit needs immediate replacement

or a clogged filter

How do I know if I need a 1/2 inch bore blower wheel

sensitivity

Rheem-Ruud 60-24180-81 Valve Els PW 17895 Precise Combustion Control: Includes aThe Rheem Ruud 60 24180 81 is a high performance 1 2" x 1 2" HSI DSI Slow Open Natural Gas Valve, specifically engineered for precision fuel regulation in residential and commercial furnaces. As an OEM gas valve from the 36G series, it features SlowOp technology to ensure a controlled ignition ramp up, minimizing pressure spikes and ensuring quiet, redundant operation. This 1 stage gas control is rated for 140,000 BTU HR at a 1 inch W. C. pressure