Saw this rating as I was comparing different cooling fans. I don’t understand this definition at all. Millimeters of Water Column is a low range metric pressure unit derived from the hydrostatic pressure of 1mm head of water at 4 degC. 1 millimeter of water gauge equals 9.80665 pascals.
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Fill a hose with water, bend it into a U-shape so you have a connected body of water inside. Then attach the fan to one side (so it blows directly onto the water surface inside the hose, and measure how much lower that surface now is compared to the other side of the hose.
The more pressure the fan can generate, the more it will push the “water column” down on its side. If it’s for example 3mm of difference, that’s a 3mm H2O fan.
Fill a hose with water, bend it into a U-shape so you have a connected body of water inside. Then attach the fan to one side (so it blows directly onto the water surface inside the hose, and measure how much lower that surface now is compared to the other side of the hose.
The more pressure the fan can generate, the more it will push the “water column” down on its side. If it’s for example 3mm of difference, that’s a 3mm H2O fan.
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