Change the fans in my cisco switch

[rogard]

Hi all,


Its only a very small mod, but I wish to replace the fans in my cisco switch as they are very very noisey.

I need a 5v 2 pin 40mm 20mm deep fan that is quiet, but the only fans I can find are about £15 each and I need 4!


To be honest although finding a 20mm deep fan would be good, its not needed, all I need is a cheap, quiet 5v,40mm fan.

Any links/info about good quiet fans to get would be great.

[LuckyNV]

I can only think of QuietPC, was browsing around on their site

http://www.quietpc.com/gb-en-gbp/products/40mmfans

[tiro_uspsss]

since ur modding & thus voiding warranty - y not go the 'whole nine yards' - cut out 2 holes for 2 x some very quiet 80mm/120mm fans - one for blowing in & the other blowing out. Place them @ opposite ends, thus creating air flow thru entire switch... just a thought which i've considered doing...

[rogard]

@luckynv
I did get these
http://www.quietpc.com/gb-en-gbp/pro...fans/mini-kaze

But they wont start with 5v

@tiro_uspsss

There isnt room, it is a 1u switch with stuff on top and below it.
and the sides are 40mm

[Levish]

maybe one of those blower fans used in 5 1/4 bays?

[rogard]

maybe one of those blower fans used in 5 1/4 bays?

nice idea!

Ill have a look and see if I can find one that will work on 5v

[henrycraig]

Hi all,


Its only a very small mod, but I wish to replace the fans in my cisco switch as they are very very noisey.

I need a 5v 2 pin 40mm 20mm deep fan that is quiet, but the only fans I can find are about £15 each and I need 4!


To be honest although finding a 20mm deep fan would be good, its not needed, all I need is a cheap, quiet 5v,40mm fan.

Any links/info about good quiet fans to get would be great.

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=160117870942

... only 10mm thick though, dont know if that matters to you. Also at 25dBA they may not be 'silent', but hey. they are cheap with no extra postage cost for buying four in the UK

[rogard]

Thanks mate.

just purchased 4=)

[henrycraig]

Thanks mate.

just purchased 4=)

np...glad to help...hope it works out for you

[kevinbo03]

In my experience, These are the approximate starting voltages for your average fan:

120mm = 2v-4v
92mm = 3v-6v
80mm = 5v-7v
60mm = 8v-9v
40mm = 9v-11v

The Low end being a high speed, The High end being a silent fan.

As an example, these fans would only start at 10.5+v:
http://www.petrastechshop.com/40scmcafan4c.html

Hopefully those fans will work out for you- Believe me, I understand how annoying switch fans can be.

EDIT: I think the ones I just linked are the ones you ordered... Eh, in that case, I'd suggest finding an old 12v power supply (Like one for a printer/scanner/speakers/cell phone, And fit that into the switch, Or keep it external. I've used them before for making black lights out of a bunch of Cathodes, for testing fans, Or just playing with various 12v electronic devices.

[rogard]

Thanks for the info m8..just makes me wonder where cisco got them, and what alternatives they had!

Anyway I got the fans above from ebay and after a bit of soldering they work like a dream.

I also stuck some zalman ramsink on the network processors, and it seems to be compensating for the slow in air flow

In my experience, These are the approximate starting voltages for your average fan:

120mm = 2v-4v
92mm = 3v-6v
80mm = 5v-7v
60mm = 8v-9v
40mm = 9v-11v

The Low end being a high speed, The High end being a silent fan.

As an example, these fans would only start at 10.5+v:
http://www.petrastechshop.com/40scmcafan4c.html

Hopefully those fans will work out for you- Believe me, I understand how annoying switch fans can be.

EDIT: I think the ones I just linked are the ones you ordered... Eh, in that case, I'd suggest finding an old 12v power supply (Like one for a printer/scanner/speakers/cell phone, And fit that into the switch, Or keep it external. I've used them before for making black lights out of a bunch of Cathodes, for testing fans, Or just playing with various 12v electronic devices.