Two computer fans on top of each other

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SUMMARY

Stacking two identical computer fans, each providing 50 CFM, can potentially increase static pressure but does not guarantee a doubling of airflow. The effectiveness of this configuration depends on the design of the fans, particularly whether they include a stator to manage airflow. If the airflow path is obstructed, noise levels will increase due to turbulence, which can hinder performance. Proper understanding of fan dynamics is crucial for optimizing airflow and static pressure in computer cooling systems.

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  • Understanding of CFM (Cubic Feet per Minute) and static pressure in fan performance
  • Familiarity with fan design features, such as stators
  • Knowledge of airflow dynamics and resistance
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TL;DR
does pressure double when stacking fans?
If I have a computer fan that provides 50 cfm, and x static pressure. By stacking two of the same type of fans together, in the same direction, will it maintain the cfm but increase the static pressure to ~2x?
 
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It will depend on the fan. If the fan has a stator to untwist the air before the second fan, the second fan should increase the static pressure difference. If the air path has low resistance to flow it may increase the flow volume.

A fan with obstructed flow will make significant noise as there will be little flow over the fan blade surfaces, air must then flow back through the gaps with turbulence.
 

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