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Old 14-09-2018, 02:45 PM
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Stonius (Markus)
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Does anyone know where to buy 40mm fans that don't vibrate too much?

Just received some brushless fans in the post. I was planning to use them to clear the boundary layer in my dob using a suspended wire mount in front of the mirror, but I can feel the vibrations when it is running and I worry that they might transfer those vibrations to the telescope and ruin high power views.

I figure not all fans are created equal, but I wonder how you even find them. 'noise' in the specs I think refers to electrical noise, I believe.


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Old 14-09-2018, 04:44 PM
glend (Glen)
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I have used small scroll fans that are vibration free in my 10" Newt to move boundary air. I bought them off ebay for something like $2 each from China. They are like the little fans used in laptops.
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Old 14-09-2018, 08:29 PM
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iborg (Philip)
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If possible, running them with a lower voltage will probably mean they run slower, and hopefully, with much less vibration.

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Old 15-09-2018, 02:18 PM
Kunama (Matt)
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Noctua 40mm are the smoothest and quietest I have found ... but not the cheapest.
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Old 16-09-2018, 06:08 PM
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ZeroID (Brent)
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Use 5 volts to a 12 v fan and suspend them on a 'spider' of fishing nylon. I just used the corner holes of the muffin fan housing to make a 4 pointed star to 4 screws in the back of the OTA mirror support. Nylon takes up any vibration easily and slow fan speed means there aren't any to begin with.
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Old 16-09-2018, 08:45 PM
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Another happy user of Noctua fans. They also come with anti-vibration rubber washer and rubber mountings (maybe not all models). But not cheap, as Matt said.
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Old 17-09-2018, 07:55 AM
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Shiraz (Ray)
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sunon maglev are pretty good - original equipment in my Starlight Express astro cam, so they have minimal vibration.
I bought a couple of 40mm ones from Altronics last year - or try ebay.

tech info at

Last edited by Shiraz; 17-09-2018 at 08:29 AM.
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