while longer runs may require 1/4" or 1/2" ID tubing to maintain signal integrity and avoid pressure lag

this component is responsible for the initial transfer of thermal energy from the combustion process to the circulating air

With an 1/8 HP motor rating and a 5 Amp contact capacity

Installation is streamlined via the barbed restrictor tee designed for 1/4" OD polytubing and an 1/8" FPT slave air connection

Always verify the model number on the unit nameplate to ensure this specific Lennox 1-stage LP kit or 2-stage compatible spring is the correct match for your burner manifold configuration

Carrier 326643-703 Burner 321894-709 while longer runs may requireThe Carrier 326643 703 Burner is a critical 4 inch inshot burner assembly designed for high efficiency gas furnaces. As a veteran grade OEM furnace replacement part, this component ensures precise fuel to air ratios, facilitating a stable and consistent flame pattern essential for optimal heat exchange. Engineered for Carrier, Bryant, and Payne residential and commercial heating units, this assembly features a compact profile, measuring approximately