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Dust Extraction #1: Rectangular Ducting Will it work

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Blog entry by Jamie Speirs posted 12-20-2010 04:34 PM 3031 reads 0 times favorited 7 comments Add to Favorites Watch
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I’m now looking at putting in ducting for my new shop. I know it is a bit early considering I may only get occupation by the 1st April 2011.
I’m hoping to have the DC and power points fitted prior to moving in the machines.
I’ve found a great 10” x 2” plastic section. It also comes in 4” x 2”

To me this seems better than using round:
It is easy to make junctions
Inspection traps would be easier
It takes up very little space

So my question to the knowledgeable LJ’s is

What are the disadvantages?

Yours
Jamie

-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe



7 comments so far

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 2988 days


#1 posted 12-20-2010 05:01 PM

I’ve read were round is more efficient than rectangular.

Here’s a good source for ductwork design.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

View sras's profile

sras

3874 posts in 1818 days


#2 posted 12-20-2010 06:20 PM

A freind of mine made his own ductwork – all metal and all rectangular. Probably the best dust collection system I have seen. It worked excellent!

-- Steve - Impatience is Expensive

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#3 posted 12-20-2010 06:22 PM

We already had this discussion on this forum not long ago, make a search for it.

-- Bert

View Jamie Speirs's profile

Jamie Speirs

4146 posts in 1545 days


#4 posted 12-20-2010 07:06 PM

Dick that is a great resource.

Steve I started thinking towards this due to most commercial ducting being square.

Bert I did a search for it on LJ’s for rectangular ducting and found nothing. If you have a link that would be great.

Charlie You got me thinking. The 2” is a definite NO. For dust it would be fine, but the planer would be a blockage waiting to happen.

Airflow is 105943.999 ft³ per hour and has 4×4” inlets or one six inch with a 2.2kw motor (about 3hp).

I have a 3ft bending brake, roller & guillotine. So I could make either round or square. It is a pity about the 2” height of the UVPVC pipe, as that would have been so easy.

Thanks everyone.

-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe

View Bluepine38's profile

Bluepine38

2907 posts in 1774 days


#5 posted 12-20-2010 09:38 PM

Got here a little late, you seem to have picked round, which is stronger for suction, rectangular would tend
to collapse in the middle from the suction unless it was real heavy. Glad you are planning ahead. I started
my dust collection system in Dec, with no heat in the shop and by the time I was finished I definitely knew
everything that I should have known before I started, but I never said I was smart, just old. Hope it all
goes as planned and that Murphy and his law get side tracked to elsewhere. Now that you are going to
be an estate owner, do we have to refer to you as Laird Alba? Good luck on the project and please keep
us posted.

-- As ever, Gus-the 75 yr young apprentice carpenter

View lanwater's profile

lanwater

3088 posts in 1623 days


#6 posted 12-20-2010 10:08 PM

Jamie, this site has a wealth of information about dust collection:

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

-- Abbas, Castro Valley, CA

View SASmith               's profile

SASmith

1607 posts in 1676 days


#7 posted 12-21-2010 03:16 AM

http://www.youtube.com/watch?v=zppN-RzqFtU is a video on making blast gates, but 8:20 in it shows wooden rectangular ductwork

-- Scott Smith, Southern Illinois

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