tho_mi
Posts: 5
Joined: Tue Mar 03, 2020 8:15 pm

Small quiet fan for Labists case

Tue Mar 03, 2020 8:20 pm

Hey,

I finally got myself a starters kit last weekend. I bought the one from Labists that comes with a small fan (30mm x 30mm). Unfortunately the fan is annoyingly loud and this seems to be a common problem with that kit (according to the reviews on Amazon). I looked for recommendations for small fans. So far I mainly found ones for 40mm x 40mm fans. Are there any recommendations for smaller fans too or does it not really matter which one I buy?

Thanks!

Disclaimer: I also posted this question on Reddit, but it hasn't been approved yet.

LTolledo
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Location: Anime Heartland

Re: Small quiet fan for Labists case

Tue Mar 03, 2020 8:58 pm

with the kit's included fan powered on, and using a smartphone's sound meter app, distance set between the fan and the smartphone at 30mm....

can you tell us the db (decibel) reading that you are getting?
"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"

Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"

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kerry_s
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Joined: Thu Jan 30, 2020 7:14 pm

Re: Small quiet fan for Labists case

Tue Mar 03, 2020 9:07 pm

those fans are cheap mine went out after only a month, you can use the 3.3v connection to make it quieter or just go without and trust the heat sinks.
i been running mine with just the heat sinks since the fan started screaming one mourning. idle temp is now <45c, using temp is just a little above 50c for action packed 720p movies, nothing else i do actually strains it.

gordon77
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Re: Small quiet fan for Labists case

Tue Mar 03, 2020 9:14 pm

Try a 12v fan run off 5v for quiet operation.

Or something like the fan shim and control it so it only works when the pi is very busy / hot.

tho_mi
Posts: 5
Joined: Tue Mar 03, 2020 8:15 pm

Re: Small quiet fan for Labists case

Tue Mar 03, 2020 9:49 pm

LTolledo wrote:
Tue Mar 03, 2020 8:58 pm
with the kit's included fan powered on, and using a smartphone's sound meter app, distance set between the fan and the smartphone at 30mm....

can you tell us the db (decibel) reading that you are getting?
About 2m away I got 35-40 db (and in that case I managed to make it "run smoothly").
kerry_s wrote:
Tue Mar 03, 2020 9:07 pm
those fans are cheap mine went out after only a month, you can use the 3.3v connection to make it quieter or just go without and trust the heat sinks.
i been running mine with just the heat sinks since the fan started screaming one mourning. idle temp is now <45c, using temp is just a little above 50c for action packed 720p movies, nothing else i do actually strains it.
Right now the case is open and I'm downloading data via FileZilla. Temperate is around 55°. With the fan it was just a bit above 30° (according to measure_temp).

edit:
Temperature is a bit above 60°.

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kerry_s
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Re: Small quiet fan for Labists case

Tue Mar 03, 2020 10:10 pm

yeah, i forgot that case has no air flow, which is why replaced mine with a simple stand.
try turning the case on it's side, the heat gets trapped on the backside of the board.

PhatFil
Posts: 1673
Joined: Thu Apr 13, 2017 3:55 pm
Location: Oxford UK

Re: Small quiet fan for Labists case

Wed Mar 04, 2020 12:36 am

Noctua brand fans are the goto choice for 3d printer upgrades

but they are not cheap https://www.google.com/aclk?sa=L&ai=DC ... BBF&adurl=

tho_mi
Posts: 5
Joined: Tue Mar 03, 2020 8:15 pm

Re: Small quiet fan for Labists case

Wed Mar 04, 2020 12:57 am

PhatFil wrote:
Wed Mar 04, 2020 12:36 am
Noctua brand fans are the goto choice for 3d printer upgrades

but they are not cheap https://www.google.com/aclk?sa=L&ai=DC ... BBF&adurl=
Yeah, they were among those recommended. Problem is, I couldn't find any 30x30.

Tzarls
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Re: Small quiet fan for Labists case

Wed Mar 04, 2020 1:09 am

tho_mi wrote:
Tue Mar 03, 2020 9:49 pm

About 2m away I got 35-40 db (and in that case I managed to make it "run smoothly").
Those numbers mean nothing since we don't know background noise levek in you room, or your phone's microphone sensitivity... Just to give some meaning, tell us the dB readings with the fan on and then the fan off. The difference will tell us something more about how noisy it really is (but then it will be just a very general idea).

LTolledo
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Location: Anime Heartland

Re: Small quiet fan for Labists case

Wed Mar 04, 2020 9:44 am

Fan test something like this:

ambient condition with the fan OFF:
same case with fan running on an RPi3B+ at the back of the monitor
and another case with same fan on an RPi4B-4G at the back of another bigger monitor just above the first small monitor.
and another AC fan for room heating is running (just 500mm below the table)
the sponge is used to dampen any other vibrations from the table that may be transferred to the phone's mic.

below is the setup: reading fluctuating between 19.6 to 21db
RPi Fan test OFF.jpg
RPi Fan test OFF.jpg (123.24 KiB) Viewed 742 times

and here is the reading when the fan is turned ON (picture taken approx 10 seconds after turned ON)
RPi Fan test ON.jpg
RPi Fan test ON.jpg (112.62 KiB) Viewed 742 times


i guess this is still very irritatingly noisy for somebody else.... :mrgreen:
"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"

Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"

tho_mi
Posts: 5
Joined: Tue Mar 03, 2020 8:15 pm

Re: Small quiet fan for Labists case

Wed Mar 04, 2020 3:33 pm

Tzarls wrote:
Wed Mar 04, 2020 1:09 am
tho_mi wrote:
Tue Mar 03, 2020 9:49 pm

About 2m away I got 35-40 db (and in that case I managed to make it "run smoothly").
Those numbers mean nothing since we don't know background noise levek in you room, or your phone's microphone sensitivity... Just to give some meaning, tell us the dB readings with the fan on and then the fan off. The difference will tell us something more about how noisy it really is (but then it will be just a very general idea).
Touche, you're right that one needs something to compare. I will do that later.

Of course it was basically silent in the room and 40 db is definitely too loud. But of course I'm curious and also want to know how loud it is/was without the fan on.
LTolledo wrote:
Wed Mar 04, 2020 9:44 am
Fan test something like this:

ambient condition with the fan OFF:
same case with fan running on an RPi3B+ at the back of the monitor
and another case with same fan on an RPi4B-4G at the back of another bigger monitor just above the first small monitor.
and another AC fan for room heating is running (just 500mm below the table)
the sponge is used to dampen any other vibrations from the table that may be transferred to the phone's mic.

below is the setup: reading fluctuating between 19.6 to 21db
RPi Fan test OFF.jpg


and here is the reading when the fan is turned ON (picture taken approx 10 seconds after turned ON)
RPi Fan test ON.jpg



i guess this is still very irritatingly noisy for somebody else.... :mrgreen:
The scientist in me is very proud of you :mrgreen: :ugeek:

tho_mi
Posts: 5
Joined: Tue Mar 03, 2020 8:15 pm

Re: Small quiet fan for Labists case

Sat Mar 28, 2020 2:25 pm

Little update. Apparently I'm not satisfied with the volume of any fan, so I decided to get a Flirc case (https://flirc.tv/more/raspberry-pi-4-case). Works perfectly, Raspberry Pi never gets above 50° and no noises.

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