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  1. Residential HVAC Forum
    Did a call today on an older Rheem up-flow furnace with two Nox rods in each of the 4 burners. The burner hi limit switch had popped. After cleaning the heat exchanger with compressed nitrogen and replacing the dirty air filter, I fired up the furnace. In 3 of the burners the rods looked in...
    nox older rheem rods
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