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I have a large heatsink with fans that push air through the heatsink parallel to the fins, very similar to Fischer Elektronik LA 9 150 230 V but not identical. I know that a heatsink increases the static pressure of a fan, reducing total airflow through the heatsink, I also know that having two fans in series increases airflow for a given pressure.

If I was to add another fan to the other side of the heatsink, essentially having two fans "in series", would this increase the cooling capacity of the heatsink?

EDIT: Will performance be increased if the additional fans don't have the same performance characteristics of the first fan? At which point will adding a fan actually reduce the cooling performance of the heatsink?

Pyrohaz
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  • How much will the life span of the "hot" fan (the one that's blowing hot air, sourced from the heatsink), be shortened because of this configuration - and is it worth it? – Chris Knudsen Nov 12 '20 at 19:48
  • A really good point to consider actually – Pyrohaz Nov 12 '20 at 20:15
  • I used a fan on the exhaust port of a circuit and @ChrisKnudsen is right. That fan gets hot, and when it's hot it may not restart, which then kills the fan permanently. Also the bearings can fail due to being overheated. – Aaron Nov 12 '20 at 20:51

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