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My duct temperature rise was actually above the 50-75 degree spec. Turned out my blower speed needed to be turned up. My furnace has different firing rates and 4 speeds on the blower.
My friend hooked up his combustion analyzer and said it was almost dead on spec. All he had to do was add a miniscule amount of air to the nozzle.
posted by 24.128.176...
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