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More dust collection.. 5" or 4"

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Forum topic by Rhaugs posted 08-04-2019 02:25 PM 331 views 0 times favorited 7 replies Add to Favorites Watch
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Rhaugs

18 posts in 284 days


08-04-2019 02:25 PM

Hi guys, getting to the point in my new shop to start seriously looking at dust collection. I have a HF 2hp motor with a SDD. The owners manual claims 1550 CFM. I’m debating between running 4” PVC for the whole thing, or 5” metal ducts. What does every one think?

The PVC would be cheaper and easier to get. But, is that extra 1” with metal worth the cost?


7 replies so far

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therealSteveN

3927 posts in 1089 days


#1 posted 08-04-2019 03:10 PM

The tools themselves almost always have 4” outlets for DC, sometimes 2.5 or 2”, in those cases you need to step down near the tool to reduce from a 4” line.

On the pipe getting to the close proximity all the wisdom goes toward keeping the largest diameter your DC can supply. Seems there isn’t an advantage to stepping up, but stepping down too soon evidently reduces flow/suction.CFMs, and every other metric you can measure. So for you keep it 5” as close as possible to each tool.

I don’t use numbers with my DC. I just do results. Does it clear the machine out without plugging up the hose?? What I have found with my HF 2 HP is that taking it tool to tool, it absolutely kicks the pants off any machine I have, and I go 8” Jointer, 10” TS, 15” planer, and 19/38 wide belt sander. So I have some fair to middling dust/chip makers. All of them can get cleaned with that vac. I’m just not real sold it can do a line of the bigger producers.

Right now mines broken down, I had always used it on the pan they send with it. I’m going to make a rolling collector, and add a cyclone to the HF unit. I’ve been hooking up to teach tool for so long, I don’t mind doing it, and I think if I had a super collector, I’d forget to open the blast gate, and turn it on, if it wasn’t for me hooking the entire thing up each time.

I bought a bigger 2hp Griz unit, and do plan to run it to my TS, Jointer, and Planer. So I’ll see if my hypothesis of Me is correct soon enough.

-- Think safe, be safe

View Redoak49's profile

Redoak49

4194 posts in 2503 days


#2 posted 08-04-2019 03:11 PM

The HF with a SDD will likely only pull maybe 600 cfm. The 5” would likely be better but you would be better just moving it to your tools.

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ibewjon

1008 posts in 3308 days


#3 posted 08-04-2019 04:35 PM

5” steel cost me less than 4” PVC, and my system does a great job with no shocks from the static that can build up on PVC. I am ready to purchase an air flow meter from Dwyer to really be able to see what it pulls, both velocity and cfm.. Mine is a 2hp from north state, converted from bags to jet canister filter.

View RobS888's profile

RobS888

2608 posts in 2360 days


#4 posted 08-05-2019 08:23 PM



5” steel cost me less than 4” PVC, and my system does a great job with no shocks from the static that can build up on PVC. I am ready to purchase an air flow meter from Dwyer to really be able to see what it pulls, both velocity and cfm.. Mine is a 2hp from north state, converted from bags to jet canister filter.

- ibewjon


Ibewjon,

Where did you get your steel pipe?

-- I always knew gun nuts where afraid of something, just never thought popcorn was on the list.

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fivecodys

1493 posts in 2151 days


#5 posted 08-05-2019 08:54 PM

After reading everything I could find on the subject, it seemed a popular consensus that the 5” was a better fit.
I used the 5” in my small layout and it is working very well.
I went with Oneida for both the pipe and the fittings. The fittings are by far the most expensive part of my layout.

https://www.lumberjocks.com/projects/388617

-- When you leave your shop for the night, make sure you can always count to 10.

View ibewjon's profile

ibewjon

1008 posts in 3308 days


#6 posted 08-05-2019 10:25 PM

From a local AC distributor. I understand that you can order 26 guage from home Depot as well. I bought the long radius 90’s from Oneida. Since I needed alot of y’s, I bought a spot welder from Harbor Freight and made my own. I posted a plan awhile back, I can do it again if needed.

View farmfromkansas's profile

farmfromkansas

125 posts in 129 days


#7 posted 08-05-2019 11:21 PM

I found Ace Hardware to be the least expensive locally for 26 gauge pipe. Also you can use the painted stove pipe which is 26 gauge if someone has it on sale. Menards has their 11% off this week. But they also get individual items on sale. Sooner or later, everything is on sale at Menards. But do not forget Ace Hardware. My local one only has pipe in 24” lengths, you should check and see if they can get longer lengths for less per foot.

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