5V fans off a power bank?

[Cris.py]

Hello,

A bit of a specific question BUT I don't know where else to post it. I need to make a very portable set of fans for a DYI project.

 

I got a pair of Noctua NF-A4x20 fans with a simple USB A -> 2 Pin fan adapter and ran it off a powerbank. And immediately noticed it doesn't do much because ofc, powerbanks are 5v!

So, before I do something stupid (and expensive) again, I just want to know if I can just replace current fans with Noctua NF-A4x20 5V fans. Would this allow them to just run at full speed when plugged in?

 

Current powerbank output: port1 + port2: 5V/2.1A max

[Needfuldoer]

Noctua rates the max input power at half a watt, they'll run without issue.

 

https://noctua.at/en/products/fan/nf-a4x20-5v/specification

 

A battery-powered personal fan is going to be a much cheaper way to accomplish the same goal, though.

[Cris.py]

2 minutes ago, Needfuldoer said:

Noctua rates the max input power at half a watt, they'll run without issue.

 

https://noctua.at/en/products/fan/nf-a4x20-5v/specification

 

A battery-powered personal fan is going to be a much cheaper way to accomplish the same goal, though.

Thank you. Sadly for my application I need quite a lot of airflow in a very tiny package, I already had problems fitting these 40mm fans and cabling etc is already in place, that's why I'm asking about just replacing fans with 5V version. 

"run without issue" hopefully means at max speed yes?  

[Kilrah]

Of course, if they want 5V and you give them 5V they run as intended.

[Levent]

If you are going to be using 20mm fans, you might want to consider using cheaper and faster delta/noname chinese fans. Noctua fans are awesome but if you need pure airflow there are cheaper and better alternatives out there all you compromise is noise.