Shop Vac Sound Proof Box / Silencer

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Project by ChuckM posted 02-25-2018 09:51 PM 2037 views 0 times favorited 2 comments Add to Favorites Watch

The silencer idea came from here:

I ran out of the sound foams and the job is to be completed when the additional foams are here.

My foams are from eBay, about $2 a piece (free shipping) and all together 10 – 12 pieces would be needed, depending on the size of the vac.

Before: 69 – 70dB
After (partial completion): 61 dB
The final noise level should be 55dB to 58 dB.

Note: The foams seen used in the youtube are probably the Contoured Sound-Absorbing Sheets from McMaster-Carr –

-- The time I enjoy wasting is not time wasted

2 comments so far

View jamsomito's profile


547 posts in 1207 days

#1 posted 02-26-2018 02:08 PM

Cool, thanks for the links. I am extremely skeptical about a cell phone dB meter – used one once and it gave me wild readings and never exceeded about 85dB no matter what loud noise I put it up against. I’ll bet your shop vac running wide open is more than 70dB, unless it’s a small one or something. But it looks like he’s using an actual dB meter in the video, and I have no doubts this absorbs a lot of the sound.

Been meaning to make one of these for a while. Thanks for sharing.

View ChuckM's profile


650 posts in 4448 days

#2 posted 02-26-2018 05:39 PM

Thanks for your comments.

I, too, was surprised that the dB for my Ridgid shop vac seemed to be low to start with. I have ordered a real meter but it has yet to arrive. I will be able to see the real improvement after I complete the sound proofing and check it with the new meter.

I would be happy if the effort brings the dB level to below 60dB, because even a top-end Festool dust extractor (CT26, e.g.) has a rated dB level of 60 dB or so.

-- The time I enjoy wasting is not time wasted

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