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Dust Collector Duct Size

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Forum topic by SuperCubber posted 04-12-2020 02:28 AM 686 views 1 time favorited 25 replies Add to Favorites Watch
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SuperCubber

1120 posts in 3089 days


04-12-2020 02:28 AM

Topic tags/keywords: dust collection cyclone pipe

Ladies and Gents,

I know this topic has been discussed numerous times. I’ve read so many of the discussions, so I don’t want to get too deep with this one.

I have (I think) a simple question. I’m planning to purchase the Grizzly G0548ZP (2HP DC with cartridge filter) and G0863 (Cyclone). My question is what size ducting to use 4”, 5” or 6”.

Here are some details that may help:
Shop size is about 300 sqft
Longest run will likely be about 15-20 feet (including drop) to the tablesaw. The planer and jointer will be a few feet from the cyclone.
Sawstop 3HP PCS
6” Jointer
Dewalt 734 planer

Thanks for any input!

-- Joe | Spartanburg, SC | "To give anything less than your best is to sacrafice the gift." - Steve Prefontaine


25 replies so far

View Craftsman on the lake's profile

Craftsman on the lake

3392 posts in 4242 days


#1 posted 04-12-2020 02:41 AM

No expert here but considering my dust collector setup and the shortcomings that it has I’d say that for a 2hp system any of those sizes would be good enough. Although I’d think the bigger the better.

My stop is just a little larger than yours and I’ve got the same tools. My jointer and planer are close to the dust collector. It gets about all of the sawdust from those. My sawstop is further away with about that 15-20 ft of pipe you mention, 4”. Not much gets caught by the collector. I’ve been thinking of another dust collector just for the saw. Or maybe I should upgrade to one larger unit. I’m been conteplating this issue for a long time and may never act on it.

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

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WoodES

184 posts in 2495 days


#2 posted 04-12-2020 03:22 AM

I would stick with the inlet size of the DC for as long a run as possible and reduce the diameter at the tool. Use 2-45’s for elbows and not 90’s to make the bends.

I have the 2hp grizzly, 6” inlet, with longest run about 35 ft. with a separator just ahead of the DC . The 6” diameter drops to 4” once the run drops to about 4 ft above the floor. Works fine for most of the work, but I did add a 2nd in-line separator that I use for the Table saw, jointer, & planer. I do plan to upgrade the DC bag to a cartridge sometime this year.

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clagwell

272 posts in 597 days


#3 posted 04-12-2020 11:53 AM

I always find it annoying when someone replies to a question and, instead of answering the question, says that the underlying assumptions are all wrong and that the OP should change his whole approach. Unfortunately, today I’m going to be that guy.

Since you’re buying all new, I recommend that you look at the G0703. It’s not much more money and should outperform the combination you’ve picked. The inlet adapter is removable so you have the choice of either 5” or 6” (preferred) duct.

You can’t really compare specs. There’s a tradition of bogus specsmanship applied to baggers. That 1700CFM is for the fan only. With the collector ring and filter connected it be about half that. The cyclone will reduce it even more. The performance curve shown in the G0703 manual should be realistic.

-- Dave, Tippecanoe County, IN --- Is there a corollary to Beranek.s Law that applies to dust collection?

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tvrgeek

1008 posts in 2454 days


#4 posted 04-12-2020 12:58 PM

Well, if you don’t want to go too deep and are too lazy to use the on-line calculators, you get what you get.
The answer to your question is “yes, 4, 5 and 6”

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Redoak49

4802 posts in 2793 days


#5 posted 04-12-2020 12:59 PM

With that dust collector, 6” pipe is close to the max in terms of maintaining the needed velocity to prevent drop out in the pipe.

I use some 4” dust ports on machines but with a much larger DC and can maintain needed velocity .

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SuperCubber

1120 posts in 3089 days


#6 posted 04-12-2020 01:09 PM



I always find it annoying when someone replies to a question and, instead of answering the question, says that the underlying assumptions are all wrong and that the OP should change his whole approach. Unfortunately, today I m going to be that guy.

Since you re buying all new, I recommend that you look at the G0703. It s not much more money and should outperform the combination you ve picked. The inlet adapter is removable so you have the choice of either 5” or 6” (preferred) duct.

You can t really compare specs. There s a tradition of bogus specsmanship applied to baggers. That 1700CFM is for the fan only. With the collector ring and filter connected it be about half that. The cyclone will reduce it even more. The performance curve shown in the G0703 manual should be realistic.

- clagwell

It’s all good. I meant to mention that for height and space requirements, I’m going with this combo. If I could work the G0703 into my space, I would be getting it.

-- Joe | Spartanburg, SC | "To give anything less than your best is to sacrafice the gift." - Steve Prefontaine

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SuperCubber

1120 posts in 3089 days


#7 posted 04-12-2020 01:10 PM



Well, if you don t want to go too deep and are too lazy to use the on-line calculators, you get what you get.
The answer to your question is “yes, 4, 5 and 6”

- tvrgeek

You know what would be cool? If you pointed me in the direction of where to find the online calculations…

-- Joe | Spartanburg, SC | "To give anything less than your best is to sacrafice the gift." - Steve Prefontaine

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SuperCubber

1120 posts in 3089 days


#8 posted 04-12-2020 01:11 PM



With that dust collector, 6” pipe is close to the max in terms of maintaining the needed velocity to prevent drop out in the pipe.

I use some 4” dust ports on machines but with a much larger DC and can maintain needed velocity .

- Redoak49

Thanks, this is what I’m getting at. I want to go as big as possible without over doing it.

-- Joe | Spartanburg, SC | "To give anything less than your best is to sacrafice the gift." - Steve Prefontaine

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ibewjon

1758 posts in 3598 days


#9 posted 04-12-2020 02:29 PM

I have a 2 hp, with pleated filter but no cyclone. I don’t have space for the cyclone. About the same size shop as well. I use 5”, 26 guage snap lok duct. Long radius 90’s. I have read several articles about duct size which stated that 5” is the sweet spot for this size of DC. My system works great. I don’t have air measurements at this time, although I plan to purchase instrumentation to do these measurements in the future. The articles stated that there is not enough volume with 4”, and air speed drops too much with 6”. A 5 hp machine will be completely different. Good luck.

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tvrgeek

1008 posts in 2454 days


#10 posted 04-12-2020 03:55 PM

GOOGLE “dust collector calculations”

Well, if you don t want to go too deep and are too lazy to use the on-line calculators, you get what you get.
The answer to your question is “yes, 4, 5 and 6”

- tvrgeek

You know what would be cool? If you pointed me in the direction of where to find the online calculations…

- SuperCubber


View JackDuren's profile

JackDuren

1258 posts in 1764 days


#11 posted 04-12-2020 04:09 PM

I took the dual 4” off and put a 6” that reduced to a 5” and ran 5” down the as a main and branched off with 4” to the tools. Works great and can run 2 machines at one time.or run the router table with ports on top and bottom at one time….

View BattleRidge's profile

BattleRidge

150 posts in 1020 days


#12 posted 04-13-2020 02:18 AM

With your shop and equipment, the DC / cyclone combo should be capable of servicing your needs without much difficulty. While there can be a lot of technical considerations and you can fine-tune everything for the maximum possible performance, my personal experience is that you can get great dust collection without a need to get overly complicated – the basics will sometimes do (but not always).

I have the Grizzly G0548Z dust collector and a Super Dust Deputy cyclone (each purchased at a great price) and while my original thought was to install 6” dust collection piping, the high cost of the fittings caused me to reevaluate. In the end I ran a short section of 6” pvc and 6” flexible DC hose between the DC and cyclone and a 5” flexible DC hose (same size of the SDD intake fitting) to an adapter to two 4” PVC pipes (which I already had on hand from a previous project). Each of the 4” PVC lines are connected to my equipment via wyes (quite affordable) with a blast gate and 4” flexible hose. I typically run between 1 – 3 blast gates open simultaneously with great collection from each of the machines I have in use. While I might be able to ‘improve’ the collection specs, my dust removal is MORE than adequate and while I originally set things up on a trial basis, it has performed exceptionally well and I have no plans to change anything, except to possibly place an additional wye & blast gate for a drill press that was recently added to my shop. In essence, you can probably go with a variety of different set-up’s and be quite satisfied so don’t get overly worried – though at the same time, it can be good to do things right the first time.

-- ~Art~

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SuperCubber

1120 posts in 3089 days


#13 posted 04-26-2020 01:33 PM



I have a 2 hp, with pleated filter but no cyclone. I don t have space for the cyclone. About the same size shop as well. I use 5”, 26 guage snap lok duct. Long radius 90 s. I have read several articles about duct size which stated that 5” is the sweet spot for this size of DC. My system works great. I don t have air measurements at this time, although I plan to purchase instrumentation to do these measurements in the future. The articles stated that there is not enough volume with 4”, and air speed drops too much with 6”. A 5 hp machine will be completely different. Good luck.

- ibewjon

Very helpful, thanks!

-- Joe | Spartanburg, SC | "To give anything less than your best is to sacrafice the gift." - Steve Prefontaine

View idahotinker's profile

idahotinker

40 posts in 2563 days


#14 posted 05-11-2020 05:05 PM

http://billpentz.com/woodworking/cyclone/

This is a like a course and I spent a lot of time studying it before I built my system. Bill makes a compelling case for larger air volumes that require larger ducting. However, after using my system for about a year now, I have learned that there is a distinction between dust collection for safety and air quality and the convenience of gathering up sawdust as best I can. The fine particulates are the health risk, and they are so fine and light that velocity is not a huge issue (assuming I understand Bill’s arguments). However, to move planer chips and the like, velocity is important, but that velocity comes at a cost of sheer volume. My 1900 com 2HP cyclone system means little if I crimp the ducts down too far. I chose to run 7” as far as I could, but that’s because of the “potential” of my cyclone. I run as close to my machines as I can, then transition to 4 and 5”. I try not to use too much flex. I got my fittings and pipe from a local sheetmetal supplier. They were great to work with. I guess my point is that if your primary goal is to save your lungs, the approach may be different. Ideally, the system design would not only pick up as much of the larger “sawdust” as possible, but capture, move, and filter the air before it is returned to the shop. Sorry for the long answer…which really doesn’t help you much :-)

-- Making sawdust in Idaho since 1968

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DaveM123

60 posts in 98 days


#15 posted 05-12-2020 01:56 AM

I have the Grizzly 0548ZP in a smallish shop. Basically it’s 18×24. I ran 4 inch pvc with separate blast gates for my ts, rt, bs, planer, drill press and floor sweep. I also have a chip separator. I typically only run with one blast gate open. This setup works fine for my needs.

-- Dave

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