If am checking the TESP WC on an Air Handler. I have one probe right after the filter below the coils and the other one right after the blower in the duct. I am getting a reading of .7, but as soon as I try to check the pressure before the coils and after the coils the reading goes below -.05 WC. Does that sound correct or do I have the Manometer setup wrong?
Dwyer Mark II Manometer question
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