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Old 01-22-2015, 05:11 PM   #1
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Default alternative to sorbothane washers? (vibration control)

So I want to install an attic vent fan in my house (1600 s.f.). I bought one for $88. I've done this in my old house, but didn't like the noise transmitted to the frame. I could hear it in the house.

So this time I want to mount it with rubber washers. I thought, well, Sorbothane should work great! Um, $30 worth of rubber washers to mount an $88 fan:

Amazon.com: Isolate It: Sorbothane Vibration Isolation Washer 30 Duro (0.5" ID - 1.5" OD - 0.5" Thick) - 4 Pack: Home Improvement Amazon.com: Isolate It: Sorbothane Vibration Isolation Washer 30 Duro (0.5" ID - 1.5" OD - 0.5" Thick) - 4 Pack: Home Improvement



Would regular rubber work as well?
Does anyone know a cheaper source of Sorbothane washers?
Why are they so pricey anyway? Active patent?
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Old 01-22-2015, 05:16 PM   #2
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Cable grommets, like for through a firewall?
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Old 01-22-2015, 05:16 PM   #3
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I've used these at work with positive results. Not much cheaper i guess...

McMaster-Carr

McMaster has a pretty big selection of vibration reducing washers. I've also used specialty rubber isolators that you cut dow to your own desired thickness. But now i can't find it. Maybe i bought it off ebay.

Edit* This fan has 8 mounting points?
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Old 01-22-2015, 05:56 PM   #4
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McMaster-Carr


These are excellent. They'll absorb your vibrations.
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Old 01-22-2015, 07:08 PM   #5
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What vehicular posted. I have used them with amazing results.
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Old 01-22-2015, 08:25 PM   #6
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Thanks for the ideas. I went and got these from ebay:
Set of 4 Universal Vibration Mount Isolator 3 4" | eBay
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Old 01-24-2015, 09:58 AM   #7
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Also consider a mass damper. I made one for a valve grinding machine I built a while back, just used 10% the mass of the system, glued it to a piece of rubber and glued the rubber to the system. Very nice level of dampening and super easy to do in my case. Also did rubber feet too
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Old 02-06-2015, 05:19 PM   #8
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The project is done. I'm quite pleased with the results using the eBay isolators I linked.
From inside the house under the fan, the cat fountain pump is louder.

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