Dust Collector Testing and Upgrade #1: Dust Collector Upgrade – Pt 1 – Upgrading to HEPA Cartridge Filter

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Blog entry by Guy Dunlap posted 06-01-2014 11:40 PM 1974 reads 1 time favorited 7 comments Add to Favorites Watch
no previous part Part 1 of Dust Collector Testing and Upgrade series Part 2: Dust Collector Upgrade - Pt 2 - Complete System Rebuild »

I have wanted to do some upgrades for my dust collection system for some time now. But before I add the new HEPA cartridge filter from Wynn Environmental, I want to take some measurements.

I test my system as it is now with a felt bag that is supposed to filter down to 1.5-2 microns and get a reading. I test with and without an Oneida Super Dust Deputy.

Then I add the HEPA filter and take some more reading and compare the results.

I know this is some pretty dry material; however the numbers that the manufacturers throw at us in regards to CFM at the unit is a mystery as to how they come up with them. This is more of a sanity check for me, and establishes some numbers to work towards to get better cleaner air in my shop.

If you have any questions, PM me or leave a reply. I also welcome suggestions on how to improve my situation.

-- Guy, Indianapolis, IN - - Instagram –

7 comments so far

View English's profile


655 posts in 1475 days

#1 posted 06-03-2014 03:20 PM

Interesting testing. If you increase the size of your hose you may see increased CFM but you will for sure see a reduction of veloscity. You need to maintain a minimum of 3500 ft/min to keep the hose from plugging up. If you make a u-tube manometer to check static pressure. This will let you know what size and how much hose you can use. The cyclone separator you added will drop from 2.5” to 4” of static. You may find that to use the cyclone you will need more HP and a larger impeller.

-- John, Suffolk Virgina

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Guy Dunlap

208 posts in 1899 days

#2 posted 06-03-2014 09:59 PM

Hey John,

Thanks for the comments and suggestions on the manometer to measure the static pressure along with the CFM. I am not sure of the 3500 fpm velocity as a minimum. While on paper you may be 100% correct, my DC has been running for over a year with the set up shown in the video, pulling only around 2500 fpm with no clogging whatsoever. I’m fairly sure that this is since it is a straight run to the machine with no long duct runs with turns and y’s.

The motor on the DC is a 1 1/5 hp 220v unit, and the impeller is 13”, which I hope is good enough to get the desired CFM (450-550) that I am shooting for. I plan to take the current DC apart and rebuild it with the impeller directly over the cyclone to eliminate any ducting at all between the impeller and the cyclone, like some commercially made units.

That is my next step in my plan any how. From there I am going to see where I’m at, and then maybe increase the hose size.

Any thoughts on what my future plans are?


Any thoughts on that?

-- Guy, Indianapolis, IN - - Instagram –

View English's profile


655 posts in 1475 days

#3 posted 06-04-2014 01:07 AM


I found some original literature on the Model 073 It is rated at 900 CFM. You can’t get 900 CFM threw a 4” hose. The static pressure would need to be more than 15”. That’s more than a Clear vue would do.

I remember from your Video that you want 500 CFM at each point. 500 CFM threw 10 ft of 4” hose will require over 4” of static. 500 CFM threw 10 ft of 4” sheet metal snap duct will only need 1.5” of static. So it is very important to reduce hose to as short as possible every where you can.

It looks like you have a 6” port reduced to 2 – 4” ports. Take off the adapter run the DC with no hose and see how much power you use. You can get a cheap clamp on amp meter at Harbor Freight for around $20. Per the info I found at Bill Pentz’s site. A 13” x 3 1/4” impeller will draw 2.5 bhp at 1” of static no duct, clean filter. Looks like the tower setup of your machine will add a little static maybe enough to keep the motor from overloading.

Where I am going with this is you need to know if your DC can handle 6” duct with low static. Your best option may be to run some very short runs of 6” Pipe around your shop then connect 4” short hoses from the duct to your tools. You may need to either increase the port size of the tools or add more ports.

I have 6” duct run in my shop. On most of my equipment I have either a 6” port or 2 – 4” ports, or 1 – 4” port and 1 – 2 1/2” port. I ran a 6” into my jointer and miter saw, Table saw has 2 – 4”. On my band saw I cut a new 4” port in the lower door and built a box around the blade under the table with a 2 1/2” port there. Table saw has 4” to the blade shroud and 4” to the over table dust collection. I get 5200 fpm at each 4” on the table saw, that’s about 475 cfm at each location.

Today I cut some 12/4 maple on my bandsaw, making legs for a pedestal table, about 10 linear feet of sawing with only maybe a tablespoon full of saw dust on the table, none on the floor.

So you need to know the static capacity of your DC and max power required by the DC with 6” opening. If it over loads the motor with the 6” opening add a few lengths of 6” duct to the inlet port and check power again.

Hope this helps


-- John, Suffolk Virgina

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Guy Dunlap

208 posts in 1899 days

#4 posted 06-04-2014 01:49 AM


That is quite a lot of useful information! Unfortunately my “shop” is in a garage were my wife’s car lives during the week, so I have to push everything against the wall and out of the way. So duct runs around the shop are not an option for me. I only hook up one machine at a time as needed.

The way the DC is now, it looks like there is a 6” opening on it with 2 4” hose connectors on it, but it is not. It is simply a plate covering a large 10” hole. My plans are to take that “stack” away from underneath the impeller and connect the impeller housing to the top of the cyclone through the 6” opening on top of the Dust Deputy, and then a single 5” hose to the input of the cyclone, which I will hook up to a machine when I need it, which is what I do now. Of course, I will need to change the openings of the table saw and jointer to accept the larger hose, and use an adapter where necessary on the planer on bandsaw.

I have an amp meter, and when I take away the stack underneath the impeller housing, I will see what the draw is per your recommendation to make sure the motor can handle it. The addition of the Dust Deputy will add static pressure when I attach it as I mentioned before.

Thanks again for all the information and help, and I will consider everything you have mentioned.


-- Guy, Indianapolis, IN - - Instagram –

View woodchuckerNJ's profile


1274 posts in 1631 days

#5 posted 06-04-2014 02:02 AM

You have a flaw in your testing.
You went from one hose to 2 hoses

1 b4 the dust deputy
and 1 after the dust deputy.

For your differential you need to connect them, that’s your real differential.

Also why are you using a flex hose to the dust deputy… go rigid and safe some static pressure and cfm.

-- Jeff NJ

View Guy Dunlap's profile

Guy Dunlap

208 posts in 1899 days

#6 posted 06-04-2014 02:28 AM


Tests were run first with the felt bag with the DD and without the DD. Then they were run with the cartridge with and without the DD. When I “dirtied” the system I only did it with the DD attached, as this is how I currently use it in my shop. The differential I was looking for was . between using a felt bag and the cartridge, which yielded a 20% increase in CFM.

I do know that they way I have the DD hooked up is working against me as I mentioned in the video, and I will be correcting that in the future.

Thanks for your comments,

-- Guy, Indianapolis, IN - - Instagram –

View Roger's profile


20928 posts in 2801 days

#7 posted 07-07-2014 01:47 PM

Gr8 stuff Guy. I just added the Dust Deputy to my HF 2hp, and like you, I’m luvin it. I did think it reduced the suction a bit, but I don’t have an anomometer. Thnx for all your detailed info. The Wynn filter was on my “to-buy” lists even before I got the DD. I’ll be getting one soon, and doing some work on my piping as well.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

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