Has anyone used these fans?

[Clunk]

Sharkoon Sys. Fan Power 120x120x25 @39dB(A) 81 cfm


From here.

I want to know if they are noisy at 7v, and if they will start up at 7v.

ta

[Cozwin]

they look abit noisy from just name obveous that will be full power but 39db for 81cfm doesnt seem that good for me.

[Agrippa]

A rating of 39dB@2400rpm is awfully loud for a fan with sleeve bearings.... Noise vs air delivery ain't that great either really, is it? Not a fan I'd have considered for a moment to be honest.

[Clunk]

Thats why I want to know what they are like at 7v.

I need 3 x relatively cheap, moderately high cfm fans that undervolt well for a little project. Only catch is that they need to be all black.

[Agrippa]

Roger that. Well, given they have sleeve bearings they should benefit more from undervolting than regular ball bearing fans in terms of noise reduction. Haven't used them so I can only speculate, but as a general rule that should certainly be the case.

[[GSV]Myocardial]

They look pretty similar to the Yate Loon D12SH-12 which people state is not particularly quiet when run at 7v or 5v.

But the Yate Loon D12SM-12 supposedly isn't too bad when undervolted to 7v and believe it will go as low as 5v and is pretty much inaudible.

[jamena]

somone pointed me at this site before but I dunno anything about them. Fans looked wuite good for the money/specs/quietness:

http://www.dorothybradbury.co.uk/

The two 120x25 fans:
Silent 7V - 38cfm <16dB(A) 935rpm
Low Noise 7V - 67cfm <27dB(A) 1635rpm

[amjedm]

The connector in the pic looks similar to the Panaflo/NMB fans - maybe made by them?

Not sure if that's any help