Thread: Ducting layout for new shed

It depends on what you want to achieve. One alternative would be to run bigger ducting down the middle, then branch off from that left and right for each machine.

What dust extractor are you using? And what size ducting? The consensus seems to be 6" trunk ducting minimum, up to 8 " or more if you are using a clearvue.

Trav

Originally Posted by Trav

It depends on what you want to achieve. One alternative would be to run bigger ducting down the middle, then branch off from that left and right for each machine.

What dust extractor are you using? And what size ducting? The consensus seems to be 6" trunk ducting minimum, up to 8 " or more if you are using a clearvue.

Trav

Because the woodshed is in the corner and that's where I want the dusty to be I thought going a single length down that side would make sense and would be less plumbing. Also, the back right of the shed (looking in from the garage doors) has a toilet and sink so I won't have any tools there and the front right has a built in workbench.

I have not decided on the DC. I'd like to get a CV but only have the cone and bin in the main shed with the motor and impeller in the wood shed. I have this 'out there' on the clearvue forum but have not got a reply yet. Otherwise I am thinking of a straight DC (minimum 3hp single phase) in the woodshed. If I end up with a CV max, I'd probably leave the first y-junction open all of the time but am planning on 6" throughout.

cheers
Mick

Originally Posted by mick59wests

- for each tool I would probably have a Y junction, a blast gate and a 45% bend to get the ducting down to the tool

Does what I am thinking make sense?


thanks

Mick

I am hoping for some additional feedback, especially on using the y junctions and blast gates.

cheers

Mick

Mick, as you know I'm working through the same process too; this may help clarify your thoughts.

Bear in mind that I'm using a DE capable of a 200mm main (CVMax, alternative was AF22 D200). It will essentially be in a "corner", though outside.

Based on BP's website, and BobL's advice, I'm running a 200mm main down the roof centre line of the shed. If you use Eximo, or PVC without glue, you can always change configuration with changing needs. Any wye to a machine will be 150mm (possibly 200mm to lathe or wide belt sander if I ever get either). Going down the centreline minimises the length of 150mm, versus crossing the whole shed width.

Every wye will have a blast gate, preferably as close to the main line as possible (have to be able to reach it if mechanical), and preferably in the same horizontal plane (i.e., only turn down after the blast gate). Less total angle turned if you go straight down (90⁰ vs 135⁰), but less material collecting in front of a closed blast gate if blast gate horizontal.

Some machines benefit from above and below suction (e.g. bandsaw and table saw). In my case, I hope to have a 150mm subfloor main (builder has confirmed he's happy for me to place that before reo goes in). But if you move machines, or slab is already in, that suggestion doesn't help and you just split the wye to each.

Incidentally, did you get my reply to your PM?

Mark

Originally Posted by markkr

Mick, as you know I'm working through the same process too; this may help clarify your thoughts.

Bear in mind that I'm using a DE capable of a 200mm main (CVMax, alternative was AF22 D200). It will essentially be in a "corner", though outside.

Based on BP's website, and BobL's advice, I'm running a 200mm main down the roof centre line of the shed. If you use Eximo, or PVC without glue, you can always change configuration with changing needs. Any wye to a machine will be 150mm (possibly 200mm to lathe or wide belt sander if I ever get either). Going down the centreline minimises the length of 150mm, versus crossing the whole shed width.

Every wye will have a blast gate, preferably as close to the main line as possible (have to be able to reach it if mechanical), and preferably in the same horizontal plane (i.e., only turn down after the blast gate). Less total angle turned if you go straight down (90⁰ vs 135⁰), but less material collecting in front of a closed blast gate if blast gate horizontal.

Some machines benefit from above and below suction (e.g. bandsaw and table saw). In my case, I hope to have a 150mm subfloor main (builder has confirmed he's happy for me to place that before reo goes in). But if you move machines, or slab is already in, that suggestion doesn't help and you just split the wye to each.

Incidentally, did you get my reply to your PM?

Mark

Mark,

I much appreciate the above. I am close to also selecting a CV (and probably a Max at that) as it seems I can separate the cone (leaving in my main shed) and the impeller/motor (putting in a separate woodshed for noise control).

I understand that every wye will have a blast gate as close to the main line as is practical but I am not sure I understand your 90⁰ vs 135^0. I would have thought the blast gates (unless you made them yourself) would have to always be 90⁰ to the pipe it was in so if it is in the wye it could not be in the same plane as the main line. If this is not correct, it is another new things on extraction I have learnt today

With your configuration does that mean you have 200mm wyes and then a 200 to 150mm adapter then 150mm piping? Or do you also put in a 150mm x 45 degree pipe in so each cross 150mm runs at 90 degree to the main line? Do you then run another 2 x 45 degrees from the sides of the shed to bring it down (assuming tool is near the side of the shed)? If this is all in another thread (or you have drawings), I'll be glad to read.

As I am now looking at something more than a 3hp dusty, I could also consider similar. I'll also start looking more at other threads on the subject.

I got your PM (thanks and slack of me not to respond back). I am in a similar situation (although moving to an already built shed) in that I am moving out of Sydney where I will have a real shed.

cheers and thanks

Mick

Mark,

I just read your thread and see with sub-floor 150mm piping yours is a fair bit different to mine

Mick

Mick, my earlier comments were specifically in relation to wyes off the 200mm main (or 225mm if using PVC throughout, as I believe Corrimal men's shed did). The blast gate is always at 90⁰ to the longitudinal axis of the duct.

If the 150mm wye goes straight down from the main, the total turn is only 90⁰, but the blast gate is below the main and theoretically stuff can accumulate in the dead space.

If the 150mm wye goes out beside the main, and you then have the blast gate in the same horizontal plane, stuff should be less likely to accumulate in the dead space as I understand it. However, you need at least a 45⁰ turn (then the blast gate), then another 90⁰ to get from horizontal to vertical, hence the 135⁰. The fewer turns the better, they need to be wide, etc.

At this stage, I will use 200mm main from the CVMax down the central spine. Eximo make 150mm reduction wyes, so everything will be cheaper 150mm gauge as soon as it leaves the main, and probably storm water PVC, with home made blast gates to ?BobL's design (I know someone's posted detailed instructions, which I have to find again).

Yes, the 150mm has to turn 90⁰ from the main to get across the shed, then another 90⁰ to go down the wall. In relation to 90⁰ turns, I understand the radius of the turn should be at least 3x the pipe diameter, so ideally a series of 15⁰ plain bends (available in SW), or at least 3x 30⁰ (DWV) plain bends.

Is that the clarification you were after?

Mark

Mark,

thanks and yes, I may even have worked that one out. The wye and blast gate 'in the same horizontal plane' now makes sense to me - and why as well. Since I am only a short #### (5'6") if I want the main duct in the middle near the apex, I'll need to work out how to do the manual blast gates so I can 'easily' access them. Who said retirement would be easy This is all 'a bit more involved' than I first thought but things are 'the way they are'.

cheers

Mick