I need to replace a pc-fan 2 pin(80X80X25mm). The only details it has are:12V/0.14A.(no RPM/CFM details). Will those details(voltage/current)enough and i can pick any 80X80X25mm 2-pin pc fan which has the 12V/0.14A value or it might be a case,that the rpm/cfm of the replacement,will be different in spite of the identical voltage/current?
closed as off-topic by Scott Seidman, brhans, Chris Stratton, Voltage Spike, duskwuff Feb 20 at 1:02
- This question does not appear to be about electronics design within the scope defined in the help center.
The first thing is to match the size, because if you don't modification to the chassis will be necessary.
Then you'll probably want to match the connector (which will also match the voltage)
The fan needs as much current as the channel it sources current from on the power supply (example, if the fan uses a molex connector with 12V @ 0.3A then the power supply on that channel needs to be able to source 0.3A. Generally this isn't a problem since most power supply channels can source 2 Amps or more)
If you get a fan that has the same voltage, and less or equal current you can't go wrong.
There's some correlation between the current drawn and the airflow a fan produces, no matter the other factors which affect this -- RPM, blade count, depth and pitch. Pick one of a similar or slightly higher current, but compare the blade details for similarity if possible. A higher current is unlikely to be an issue with the supply, though a fan that runs at a higher RPM will be noisier if the original one was a low speed device.
For a system that is going to get a lot of hours, pick one that has a rated life that is at least 40,000 hours (reputable companies put this in their datasheets), this probably means it'll have ball bearings rather than sleeve bearings. I replaced one a couple of days ago that had about 18 years of service before it started squealing, the bearings were bone dry and beginning to shed metal that was coating the magnet inside the rotor.