Thread: Installing my Dusty - WIP

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Final major alteration to my system. Have fitted a 150mm inlet to the separator. Loose panel inside is still to be fitted to block the 125mm inlet. Also need to tidy up and smooth down the weld area.
I will probably fit the wok after I do some flow figures.
New flow readings will be be in the Generic 2hp thread including wok installation observations.

Thought I'd post it here as a sort of conclusion to my dusty installation.
Thanks for those who have followed this thread

Originally Posted by Lappa

Power now in the dusty shed and dusty back in the shed. Took some decibel readings WITHOUT the collection bag. It sounds noisier than before so I'll do another set of readings when the bag is fitted.

1 metre from dusty shed with door open, directly in front of door - 85.9 dB
1 metre from dusty shed with door closed - directly in front of door - 76.5 dB
1/2 metre to side of dusty shed - 73.6 dB
Back fence - 62.5 dB
Side fence with neighbours - 60 dB
Background noise with dusty off at all four locations - 58 to 58.7 dB.

meant to ask this but forgot, how far is the back fence, and the "side fence with the neighbours" from the DC ?

Back fence is approx. 10m and the distance to the side fence, measured at a slight angle was approx. 15m. There is an outlet vent on that side of the cabinet.
The fence on the side of the yard that the DC is near, is a 2.5m Bessa block wall. This runs back to a 2m paling fence at the rear. The reason I mention this is that there may have been some reflection.

Originally Posted by Lappa

Back fence is approx. 10m and the distance to the side fence, measured at a slight angle was approx. 15m. There is an outlet vent on that side of the cabinet.
The fence on the side of the yard that the DC is near, is a 2.5m Bessa block wall. This runs back to a 2m paling fence at the rear. The reason I mention this is that there may have been some reflection.

Thanks for that info. Yes there will be some refections.
I realise this is an old thread but there are a couple of things that newbies might need to consider before they settle for a simple garden shed as an enclosure.

So what read from this is your enclosure is reducing SPLs from 85.9 to 76.5 dB on the front and 73.6 on the side 1m from the enclosure.
The latter number suggests some sound leaking from the door gaps or door structure, or it could be that this is the larger (more flexible) are wall able to re-radiate sound better than the side wall of the enclosure.
The front of door reduction is 9.4 db which is pretty good for a basic garden shed structure.
The resulting 60-62.5 dB at neighbours fences is fine but we need to bear in mind is your enclosure is the 10 and 20m from neighbours fences.

The problem with using just a garden shed is when (like HeyBluey) the neighbours fence is just 1m or less away from the enclosure which is an increasing the situation for many woodies as block sizes become smaller and houses become larger leaving little or no distance to neighbour fences.

The other factor is, where is where enclosures are located relative to the shed exterior wall - if it's in the middle of the shed wall in an alleyway (like HeyBluey's , and mine) the majority of the sound will be reflected immediately back to the neighbours. whereas if its near a corner of a shed, some of the sound will dissipate around the side.

Even though I had extensive sound insulation, being in an alley way (enclosure door is ~600 mm from fence) my first effort only got me around 10 db and I the did a bunch of other stuff but only ever got it down to a 17.5dB reduction at the fence line.

The first 10 or so dB reduction is, as your garden shed enclosure shows relatively easy to gain in wide open back yard situations. The next 10 dB are harder to get by improvements to the enclosure especially if the enclosure is in an alley way situation, and getting more than 20 dB becomes even harder.

Of course if you have a good relationship with your neighbours (I acknowledge this isn't always easy) these problems can be overcome with a bit of constructive conversation over a beer or coffee. And, no, I don't mean they'll just give in (and seethe in privacy) and let you do whatever you like!

The only real difference between my and MandJ's readings is 1m in front of a closed door. Door open, almost the same, background noise similar. My shed has no insulation and no mufflers/silencers on the outlets which are at the sides of the shed.
I built to suit my circumstances - anything else would have been an overkill in MY circumstances.
I will stuff some spare insulation on the front if the shed and see the difference. I'll also measure at 3 and 5m like MandJ.

Originally Posted by Lappa

The only real difference between my and MandJ's readings is 1m in front of a closed door. Door open, almost the same, background noise similar. My shed has no insulation and no mufflers/silencers on the outlets which are at the sides of the shed.
I built to suit my circumstances - anything else would have been an overkill in MY circumstances.

Sure, I appreciate all that and I would have probably done the same, but as can be seen in HeyBluey's Photos of what he has to work with, he has quite different circumstances, so recommending a garden shed may not be that helpful.
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1) if you go back to heybluey's lfiginal thread and go to Post 5 you will see that I commented on the narrowness of the space and how he would probably need access from both ends. I've never seen that in a garden shed that narrow.
2) I never recommended, as you say, a garden shed. I gave him another set of figures to look at. Why? Because people can go totally overboard - my recommendation would be to build his shed then add to it as needed to arrive at a required solution rather then build a Taj Mahal to start with.
Cheers

And the point of referring heybluey to a set of figures that don't apply to his situation is ???????
OK it could be "what not to do" , but this was not obvious in the "set of figures "as it did not show the critical distances from the enclosure to the neighbour's fence.

I 'm not convinced building a lightweight structure and then just adding acoustic insulation to it as needed is the way to go.
Efficient acoustic isolation starts with an appropriately solid, strong and heavy enough structure rather than adding more and more material to a lightweight structure. We don't usually build a shed by building the lightest weight structure possible and then adding strength to it if it is not strong enough - well some people might but it's hardly the right way to go about building anything.

Calm down BobL and let me get on the soapbox
all it was, was another set of figures to look at. In many ways similar to others have posted here but as I have a retail loading dock near me, plus a major road, my background noise was higher than MandJ when I tested. My side fence, closest to the dc is as close as heyblueys.
Dusty shed corner on the right, neighbours fence in the middle, garden shed on the left.
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I said I would test to the same distances as MandJ so we had a better comparison but you couldn't wait.
i personaly don't see the need to over build, I see the need to build to a requirement but nowhere did I say to build a light weight structure - their your words. Sure, I have a tin shed but I didn't say to use one even though in my case it's adequate.
I have reported data for all modifications and changes to my system hoping they would aid people doing the same thing as me but obviously sharing this data with others is frowned on by you. Then again, you aren't the only one on this site.
Thats OK, I'll keep posting my data and thoughts and you can do the same, the difference being that I won't rubbish other people who's data I dislike or don't agree with.
Cheers