A box for quieting a shop vac

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Forum topic by HarveyDunn posted 01-26-2014 05:18 PM 2906 views 1 time favorited 12 replies Add to Favorites Watch
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328 posts in 2299 days

01-26-2014 05:18 PM

Found a nice article in FWW about building a box lined with acoustic material. Your shop vac goes inside the box.

In their test, it reduced the noise by 25 dB. Nice!

If I were going to pair my shop vac with something like the Oneida Dust Deputy, would I want the DD inside the box as well? Or should it sit on top of the box, out in the open?

12 replies so far

View JollyGreen67's profile


1676 posts in 3330 days

#1 posted 01-26-2014 05:29 PM

I can’t access the link, but question: How does the box exhaust all the heat of the vac ?

-- When I was a kid I wanted to be older . . . . . this CRAP is not what I expected ! RIP 09/08/2018

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694 posts in 2503 days

#2 posted 01-26-2014 05:38 PM

There is an exhaust outlet 2 in by 27 in.

View Nicholas Hall's profile

Nicholas Hall

352 posts in 2674 days

#3 posted 01-26-2014 09:14 PM

I’ve seen a couple shop-vac silencer projects posted, but I don’t recall seeing any dust deputies on those posts. I could be wrong though. Do a search and you might find one that integrates a dust deputy. If you do, you can pm the author to see if the approach worked.

If it were me I would integrate the dust deputy inside the box. It’ll be quieter that way.

Let us know how it works out.

-- Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read. -Groucho Marx

View JollyGreen67's profile


1676 posts in 3330 days

#4 posted 01-26-2014 11:40 PM

I don’t think the dust deputy makes any noise compared to the shop vac.

-- When I was a kid I wanted to be older . . . . . this CRAP is not what I expected ! RIP 09/08/2018

View bigblockyeti's profile


6148 posts in 2288 days

#5 posted 01-27-2014 01:44 AM

I’ve thought about doing the same with one of my shop vacs. The thing works great, but has to be the noisiest vacuum I’ve ever used, it absolutely screams. My main concern would be making something that already takes up too much room, taking up even more room after being surrounded by a box. Motor cooling as mentioned above would also be of concern and if the box was fairly tight around the vac, it might need to be a design specific to that vac to make sure things didn’t get too hot inside!

-- "Lack of effort will result in failure with amazing predictability" - Me

View Ripthorn's profile


1459 posts in 3553 days

#6 posted 01-27-2014 02:19 AM

The exhaust port is only for air movement. The acoustic foam will result in increased temperatures very quickly. I built an anechoic chamber back in school, approximately 500 cu Ft and four light bulbs Bot the internal temp up to over 80 in perhaps two minutes. Good acoustic absorption always is tied to increased thermal retention, especially since the sound is getting converted to heat inside the foam.

-- Brian T. - Exact science is not an exact science

View jap's profile


1251 posts in 2622 days

#7 posted 01-27-2014 02:55 AM

I thought about putting my shopvac into a box like that, but I figured that since I usually use the shopvac with others tools that are loud (tablesaw, sander, ect…) I’m going to have to wear earplugs anyways. So the box wouldn’t make much of a difference.

-- Joel

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Craftsman on the lake

3072 posts in 4005 days

#8 posted 01-27-2014 03:09 AM

Hmm… not all but many of my tools are louder than my vacs.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

View Jokker78's profile


148 posts in 2265 days

#9 posted 01-27-2014 04:04 AM

put the dust dep outside the box

-- Measure once, cut , measure again, cut and damn its still to short

View MalcolmLaurel's profile


300 posts in 2190 days

#10 posted 01-27-2014 12:00 PM

Re cooling… remember that when the vac is running, its always pulling fresh (if dusty) air in, and naturally you need an air exit of at least the same size. Ideally the exit should be located so that the exhaust air passes over the motor before exiting.

-- Malcolm Laurel -

View Jim Finn's profile

Jim Finn

2765 posts in 3489 days

#11 posted 01-28-2014 03:18 AM

I have two shop vacs for two different pieces of equipment. I put them both outside the shop and set a plastic tub over them. Works well for me.

-- No PHD just a DD214

View Bill7255's profile


428 posts in 2852 days

#12 posted 01-28-2014 09:38 PM

I did something different. I picked up a well used 6.5 hp shop vac at a yard sale. Didn’t need it but for $2 ok. Wanted one of the HEPA dust extractors, but not at the $500 price. So I bought a HEPA filter and a drywall dust bag and made a wood box to house it. I know it is not a real certified HEPA, but works for me. I bought a Dust deputy and initially had it on a 5 gallon bucket, but made a box for that also. Not a thing of beauty, but works very well. The vac box size is 20 side 30 long and 28 inches high. Two compartments, one for the vac and one for storage. I can get about 3 different hoses in it. It could of been made about 2/3 size. Regarding noise, 65db background it is just about 80db. My regular shop vac is over a 100db (high as my phone app goes). Sorry for the lousy pictures, but it it is 3 degrees F here and lights would take too long to warm up. I must say the Dust deputy is quite efficient as I have filled it’s container twice and only have a cup or so in the bag filter. I primarily use it with sanding and dove tail work and when I clean my Wynn filter on the DC.

-- Bill R

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