Upflow furnace, Goodman GMH950453BX.
I put the probe in the blower compartment to get return static, measured it with no filter and with a six month old MERV 11 installed.
For supply static, I put the probe near the center, just above the heat exchanger, where I found the highest pressure reading.
For TESP, I added the return suction with filter to the supply pressure.
Did I measure it right? (I wonder if the meter changed zero between the 2.5 and 3.0 ton readings, but it always read 0.00 in basement air)
Do these numbers look OK? (my filter is 20x25x4")
According to the Goodman airflow chart, I'm getting about 725-730 cfm on the 1.5T setting. (734 at .30 static, 704 at .40)
Blower tons Return__Return filtered Filter Drop Supply __ TESP