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Does anyone know what is the best way to determine total airflow on a variable speed furnace when a duct traverse is out of the question? i am trying to find out how much air the furnace is moving in the 1st. stage cool, 2nd. stage cool, and cont. fan modes. i can not do a duct traverse due to the furnace being installed in a finished basement, and i can not get to all of the ducts that come off the plenum. since at this point i am more concerned with how the furnace is doing in the cooling months, and the furnace has an ecm, i am not sure the sensible heat formula is going to help. thanks to all.