Alphacool SL-15 PWM: Low profile does not equal low airflow

Static pressure per euro

There are situations where standard 25 mm fans will not fit. Even the 120 mm format therefore offers lower alternatives. The first thing that naturally comes to mind is that such fans mean a trade-off in cooling efficiency. However, this may not be true and the hassle of thinking about how to fit a thicker fan inside may even be quite unnecessary. A well-designed rotor can achieve fully-fledged results when compared to a thicker rotor, even if it is slimmer.

Static pressure per euro

Explanatory note: The following charts will give a quick overview of the amount of static pressure per price unit. We can thus talk about the coefficient for the price/performance ratio.This is the ratio of the measured static pressure in mm H2O to the price of the fan (in euros) multiplied by 1000. This is specifically so that the results do not start with unflattering zeros.







Why is there a missing value sometimes? There may be more reasons. Usually it is because the fan could not be adjusted to the target noise level. Some have a higher minimum speed (or the speed is low, but the motor is too noisy) or it is a slower fan that will not reach the higher decibels. But the results in the graphs are also missing if the rotor is brushing against the nylon filter mesh. In that case, we evaluate this combination as incompatible. And zero in the graphs is naturally also in situations where we measure 0.00. This is a common occurrence at extremely low speeds with obstructions or within vibration measurements.


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