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Use CAUTION when venting outside of a conditioned space (heated or cooled).
A functioning DC pulls large amounts of conditioned air outside that has to be made up and reconditioned.
If you have any fueled heating devices such as furnace or water heater you could actually cause a negative draft and pull carbon monoxide (CO) back into your workspace whenever they are working.
Thien Cyclone Separator Lid Discussion / Re: Here's the plans.
« Last post by deancrozon on February 12, 2017, 11:44:40 AM »
Can this be scaled up to 48 inch diameter with a twenty inch inlet, and still work ok?
Thien Cyclone Separator Lid Discussion / Re: new filter supplier
« Last post by Carl on February 11, 2017, 05:58:40 PM »
Thanks for starting this thread Bridger.

I have also looked for alternatives and read about someone using heavy truck air filters (the are similar in size to what we need).  In my pursuit I came across Donaldson Torit P190817-016-436 or P190818-016-436.  These filters have a13.84-inch outer diameter and a 26.00-inches length, with a 2.00-inch pleat height.  Open at both ends with rubber gaskets with a continuous outer layer of 0.2-0.3 micron .  I bought 2 from ebay for $80 or less in the past year.  I also came across  this supplier ( who sells them new for $89.  It appears these are actual Donaldson filters as many filter suppliers (like Killer Filter) make equivalent parts that fit the original manufacturers part, but are not original manufacturer parts.  I have never ordered from systech, but they seem to have the best price for those models.

Hope that also helps with an alternative
Thien Cyclone Separator Lid Discussion / Need help designing my DC system
« Last post by Tjdux on February 10, 2017, 11:51:43 PM »
I'm in the process of designing my DC system. I have already bought the "2hp" harbor freight unit because that's all the budget I have for one. I do plan to run 4" pvc ducting with blast gates and the whole works. That part I feel I have a decent handle on.

Here is where it gets tricky for me. I'm running out of floor real estate quickly. I would like to hear of examples or thoughts of people putting their DC units up in the rafters or on the walls.

I want to run a thein baffle chip collector. I am also considering venting out a window if I go wall mount or possibly a Wynn filter for attic. Or could I mount the dc in the attic and run ducting out the window without compromising suction. To run that duct would take at least 1 maybe 2 or 3 90 degree corners.

Next, I hear thein baffles tend to stop so much chips and large dust that the bags hardly fill up at all. If I put it in the rafters i definitely don't want to be up there changing bags like ever or at least not often. I would leave the chip barrel on the floor. How far could the thein baffle container be from the DC unit and still be effective?

Also if I vent outside I don't even need a bag right?  How much mess does venting outside create?  Also I live in town and I have kids as my neihbors.  Is venting outside dangerous as far as dust in thr air or will it spread fast enough not to be a problem?  Obviously youwouldn't want to play right under it but as long as your a bit away?

Currently I'm leaning towards trying to keep everything within the footprint of the 55 gal drum I plan to use as the separator and window vent because that seems easiest and cheapest.

Thanks for any advice.
Thien Cyclone Separator Lid Discussion / new filter supplier
« Last post by Bridger on February 08, 2017, 03:53:54 PM »
I did some searching for suppliers of pleated filters. Of course the current gold standard is the Wynn, reasonably priced at $200. I saw references to using large diesel truck air filters, so I did some searching down that path, but got nowhere. I found a company, Killer Filter who makes filters, so I called them to see what they could do. I showed them Wynn's page. they said... let me get back to you. what they came back with is their brand new (since my inquiry) model 114-7449.
it is less stuff than the Wynn in that it is the filter only- no hold down hardware or lid, but that stuff is easily enough fabricated by woodworkers who are willing to tinker with their dust collectors. for me, the price difference is worthwhile. I ordered it. when it comes in I'll report back.

I don't work for Killer Filter, Yadda yadda. just found what looks like a good deal.

    Unit Price: $ 131.25 discounted from $161.25. they said they would give this price for users here if you ask for it.

Spec’s 17.59” OD x 12.233” ID x 23.00” HGT 222 Sq. Ft ICF-15 Nano-Fiber Media, Inner & Outer Core, 5/8” x ˝” Gasket installed on Outside Diameter, Open/Open

Freight Terms:  FOB Louisville; pre pay & add
Lead Time: 7-10 days ARO
It’s a MERV 15 rating.    It performs at 80-95% on the 1 micron or less size.  The E1 test result for initial efficency % on .30-1 micron size 88%.

reach them at:

Killer Filter
1213 W. Flint Meadow Dr.
Suite 4
Kaysville, UT 84037
Phone: 888.950.7248  Fax: 888.912.6789

hope this helps someone.
Thien Cyclone Separator Lid Discussion / Re: Introduce yourself...
« Last post by Bridger on February 03, 2017, 07:31:20 PM »
I built my first separator a few years ago. Interesting to see how the design has evolved. Getting ready to do some upgrades to the old one and build a second unit.

Thanks all
Thien Cyclone Separator Lid Discussion / Re: Introduce yourself...
« Last post by Tjdux on February 03, 2017, 04:36:16 PM »
Hey I'm TJ and I'm working towards adding dust collection to my shop.  I have lots of questions and I plan to start my own thread but this is definitely the right place.  Everything on the entire Internet seems to point right back here eventually when talking about custom DIY dust collection.  THANKS for all the folks here answering the hard questions from guys like me.
Thien Cyclone Separator Lid Discussion / Re: Replacing plastic bag with cloth bag.
« Last post by tvman44 on February 03, 2017, 07:48:40 AM »
I did not build the Top Hat yet, I built the original design in the barrel a couple of years ago and have not emptied the bag yet.  I recently eliminated the bag & vent outside since there is almost nothing after the Thein separator.  I do plan to try building a TopHat model just to do it as I love to tinker.
Thien Cyclone Separator Lid Discussion / Re: Replacing plastic bag with cloth bag.
« Last post by bigfoot on February 02, 2017, 11:57:36 PM »
Yeah, I am using the top hat so I assume I hardly need to empty the bag, cloth or plastic. Just assuming better airflow, but having a 3/4hp, maybe won't be much. :D
Thien Cyclone Separator Lid Discussion / Re: Introduce yourself...
« Last post by jcarp on February 02, 2017, 09:38:24 PM »
Hey everyone. My name is Jason and I'm from Texas.

I'm thankful for this great collection of knowledge. I've lurked for awhile now and I am about to begin a top hat build for my HF DC. All of the different ideas, implementations, and research you guys have done ahead of me is really fantastic. Phil, I'm thankful for your "open source" contribution as well to get all of us started. I'm not always the best documenter of my projects, but I'll try to keep up with it as I go along and create a post at some point. In the meantime, keep the posts coming, and know I'm thankful.

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