Can I hold off upgrading dust collector in this scenario?

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Forum topic by stuntman2625 posted 08-31-2020 07:44 PM 566 views 0 times favorited 7 replies Add to Favorites Watch
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8 posts in 99 days

08-31-2020 07:44 PM

Topic tags/keywords: dust collection

Hello all,

I’m sure there’s been multiple threads discussing this exact item already, but I’m not having a lot of luck finding them. I’m setting up my new home workshop and I’ve already been using the standard Dust Deputy deluxe on a mobile cart for the last month which has a 2.25” connection. I’ve been doing all sorts of reading on how much better a 4” system would be compared to a 2.25” system so when I run the hoses/pipes around my shop in a more permanent solution, I’d prefer to run 4” hoses everywhere.

My question is, can I connect the 2.25” Dust Deputy to the 4” hose right at the dust collector with an adapter or will this cause issues? As long as it sucks as well as a 2.25” pipe would suck that’s all I really care at this point. I’d prefer not to replace the dust collector with a larger 4” one right away since I just purchased it, but I also want to leave myself with flexibility to do exactly that in the future without having to replace all the pipes running around the shop.


7 replies so far

View pintodeluxe's profile (online now)


6239 posts in 3735 days

#1 posted 08-31-2020 08:01 PM

You only want to step down pipe size right near the tool. What you’re proposing doesn’t sound like it will perform well.
If you want to set up a whole-shop DC system with fixed piping, 4” pipe would be minimum. Some might argue that 6” pipe is minimum. Weather or not your powerplant will provide adequate suction is another question. Just ask yourself, “was this powerplant designed to be used this way?” If the answer is no, then it probably won’t give optimal performance.

Usually people aren’t happy with their DC system until they step up to a wall mounted cyclone, but there are exceptions I suppose.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View ibewjon's profile


2154 posts in 3715 days

#2 posted 08-31-2020 08:02 PM

First, drop the idea of running multiple hoses in place of ductwork. Hose has too much loss. And you may be better off with 5” duct, not 4”. You will need the larger super dust deputy with proper size connections. Yours is for a shop vac, not a dust collector.. both work well but in their proper places.

View metolius's profile


262 posts in 1652 days

#3 posted 08-31-2020 09:49 PM

A proper 4” system moves too much air for a 2.5” dust deputy. Greater than 200cfm, if not before, content will spin without falling to the bucket. You’ll want to consider the likes of a 4” super dust deputy if you want a 2-stage.

-- derek / oregon

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3175 posts in 3866 days

#4 posted 09-01-2020 12:35 AM

Your 2.5” system is great, for vacuuming and hand tool dust collection, but horrible for dust collection off machines. On a machine, it would be better off calling it a dust reduction system (and not a good one).

As to hoses, there is nothing wrong with them, IF you’re not making long runs. After all, it would be absurd for the average woodworker to try to hard pipe directly to the unit. You want short runs off of smooth wall pipe.

As a few examples, my sanding station is a six foot hose away from the collector. My jointer is about five feet from it. The table saw is ten, so the ideal for it is, smooth wall down the bed and sweeping bends at the saw and feeding the pipe from the collector.

If I had to run across the room, certainly, I would want smooth wall wherever I could plant it. Then, what size I used would depend on what kind of collector I was installing. For example, my big Oneida cyclone liked 8” pipe. HOWEVER, a smaller unit pulling through pipe that big would have a problem.

You need the pipe to be big enough to move as much air as possible, but not so big it slows the air movement to where chips start dropping out.

When thinking of piping, think of your home cloths dryer. Every bend equates to adding five feet of pipe. Next, consider the world of hydraulics. For example, a fire truck may have to push water into the hose at around 700 PSI to get 180 PSI at the nozzle 1000’ away. So it goes with your clothes dryer. Start with (making numbers up) 300 CFM and, at the end of twenty feet of pipe with two bends and you’ve already lost 100 CFM.

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12429 posts in 1906 days

#5 posted 09-01-2020 12:48 AM

+1 to all said what you have is way too small for running 4” pipe through out the dont mention what you want to connect to this,a table saw or planer or drum sander needs air volume not suction from a vac.use what you for now if thats all you can afford but when you run the 4”or better you gonna need an upgrade.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View stuntman2625's profile


8 posts in 99 days

#6 posted 09-07-2020 03:34 PM

Thanks all for the feedback. What I’m taking away from this is that my 2.5” dust deputy probably isn’t going to do much for me no matter what size of pipe I’m running to it :) I kind of figured that was going to be the case; I was just hoping that it would still somewhat work while I had it connected to 4” pipes until I eventually replaced it with a larger dust deputy. But it sounds like it may not work at all unless I’m upgrade it right away. I definitely don’t plan on running 2.5” pipe around the workshop either way and will use 4”

Eventually I’ll want to connect my system to many components: table saw, miter saw, drill press, sander, planer, jointer, but some of that is down the road a bit.

View ibewjon's profile


2154 posts in 3715 days

#7 posted 09-07-2020 09:39 PM

Don’t rush the 4”, read up first. Wood magazine recommends 5” for 2-3 hp collectors. I went with the 5”, and am very pleased with the system.

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