3 ms·

TIL about mmH2O. Is this common in HVAC? I thought pressure was mostly in mmHg or bars(millibars).

• Cerium 8y ago
  Yes, fans usually have a specification on the pressure they can create in inches of water or millimeters of water. I think it is because you can measure it yourself with just a tube and water- open end manometer.
  • raldi 8y ago
    How?
    • masklinn 8y ago
      Put bottom end of tube in water, put fan at top of tube drawing out, turn fan on, see how much the water climbs inside the tube?