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Air Flow Q refers to the air volume passing through the outlet (or intake) section of a fun per unit time. The unit of Air Flow is generally CFM (cubic feet per minute) or CMM (cubic meters per minute).
Air pressure P refers to the pressure difference between the air outlet and intake caused by a fan, and the unit is generally mm water column, which is like the millimeter mercury column to measure atmospheric pressure. The difference is few, so it is generally in the unit of the water column (mmH2O).
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