Fitting the Wynn Environmental C1425 Filter to the Jet DC-1100 AKA - A Better, Less Expensive Filter for the JET DC-1100

Someone asked who I was, my name is Paul Turner.  
02/23/12: original article.
02/25/12: better pic of flange, fixed typos, add links to WynnEnv.

Any questions or comments about these pages, please email .

During the research on improving my Jet DC-1100's particle separator, I ran across Wynn Environmental's dust filters.   They have a lot more filter area, even though they appear slightly smaller, filter particles to about 1/4 the size of the Jet filter, and they cost about half of what a Jet filter costs.   So I set myself the task of fitting one to my DC-1100.   Here are the results.   BTW, this approach will work to upgrade a DC-1100 bag type to use a canister filter.

I received the Wynn Envronmental C1425 yesterday (02/22/2012), so today I'm working on fitting it to the JET DC-1100C.

Dick Wynn suggested the flanged version of the filter (C1425) which opens a lot of mounting options.   After measuring and thinking about this, I have decided to take another of Dick Wynn's suggestions and make a 3/4" plywood donut that fits within the top of the Jet's separator housing, and is flush with the top.   Dick also noted I could use the open top version (C1425) or a closed top (C1425C), both have flanges.   One thing about this type of attachment, I can leave the donut in place and put the Jet filter on for a comparison test.   The open top with a plastic "cake plate" cover would allow me to watch whats going on down in the throat of the separator, so I opted to go this way.   The flange has 3 bolt holes at 120° spacing to hold the filter down and slightly compress the gasket, insuring a good seal.   There is a fourth bolt hole between two of the others, but I decided I didn't need it.   The flange also has a turned up lip (probably for strength) which limits the kind of bolt head, so I decided to use a 1/4-20 round head bolt with phillips slots which fits nicely and still gives me quick on/off using an electric screwdriver.   The Jet's separator housing isn't perfectly round (it doesn't need to be) but for the most part is it 19 1/2" inside diameter.   I cut a 3/4" plywood circle to fit (19.5" diameter), then cut a 14" concentric hole for the air to pass (note the Jet's separator throat is 9" in diameter) thus creating a donut.   I painted the donut with clear polyeurethane and let it sit overnight.   The clear polyeurethane's hard surface allows the gasket to seal better and eliminates the porous surface for dust particles to be trapped.   I drilled 4 holes, around the edge of the Jet's separator, about 3/8" below the top, chamfered them with a larger bit, to mount the 3/4" donut.   Then I centered the C1425 on the donut and marked where three of the holes in the flange were on the donut.   There are 3 holes in the flange, at 120 degree spacing with a fourth between two of the others, I chose to use the 3 at 120 degrees.   I drilled a pilot then 1/4" through holes, and counter bored from the bottom for the top of a 1/4-20 tee nut (5/16" counterbore).   I ran a bead of silicone sealer around the edge of the donut after attaching it to the separator with four #8 X 3/4" screws.   Dick also recommends that you use 80# or less air pressure when cleaning the filter.  

In the Jet's case the Wynn filter was smaller than the original Jet filter.   If your DC is smaller than the Wynn, your donut will need to be larger than the separator, and you can use small (2 or 3") stanley angle braces attached to the inside of the separator and to the under side of the donut.   Then you can put the tee nuts outside of the separator.

The Wynn Environmental C1425 arrived.

It has a flange.   The flange has a rolled up lip (probably for strength) so it limits the kind of bolt head or you would need a spacer block to raise the bolt head above the flange lip.   This flange doesn't require a lot of stress so it's width isn't a big problem.   The simplest technique seems to me to use a 1/4-20 round head bolt, which fits nicely.

The C1425 has an open top which I will enclose with a "cake plate", again, per Dick Wynn's suggestion.   I would guess the open top allows these filters to be stacked to double the air capacity, if you choose to do that.

The cake plate after sealing it.   You can see the silicone sealer bead, I put a lot on since the cake plate had a small contact area.   I wanted it turned this way to make it a little easier to clean, since it is a little higher than I can see without getting on top of something.

This is where my DC-1100 lives, back against the wall, you can just see the "Dust Dawg" filter to the left of the bandsaw and behind the other equipment rolled up in front of it.

Both filters side by side.   You can see where I sealed the gasket to the new filter (not very uniform I'm afraid) to make sure the gasket stays in the correct place when being mounted.   The Wynn is about 1 1/4" smaller in diameter than the Jet, but, the Jet filter's pleats are approximately 1 1/8" deep where the Wynn C1425 is 1 11/16" deep, yielding a lot more surface area.   A minor problem with the JET filter is you have to hold down slightly on top while tightening the 4 bolts around the edge.   This is a little unhandy and may work loose with vibration and positive pressure.   With the mounting technique I'm using the bolts pull the filter toward the donut making the gasket seal the opening.   If the Jet's separator worked correctly, you wouldn't need the paddles in the filter, and it could be less expensive.   I don't have any quams about the Wynn Filter not having paddles.

The Jet with it's filter removed.   Note the "sawdust hill" in the center of the bag, this came about when I added the tin man's hat and brim.   I made the 4 X 4" plenum several years ago.

Even after 3 months running with the Tin Man's hat (shiny cone in the center of the separator throat), the throat top is clear of piles of sawdust.   Here is a link to the page on tin man's hat.   Here is what the top of the throat looked like before the cone was added.

Of course there is a little fine dust, as shown here on the tip if my finger.   But that is what the filter is for.

The donut sitting on top of the separator ready for a test fit to the separator.   I used a piece of rough 3/4" plywood which I had available, then painted it (after pic taken) with clear polyeurethane to seal the wood, reduce dust catching pores, and allow a better seal.

Smooth cut, I am surprised it looks this good.   I used a Festool PSB 300 EQ jigsaw, the Festool circle cutter and a Bosch T101A0 blade.

The bottom of the donut with three 1/4-20 tee nuts.   Seen here after the donut was painted, I installed the 1/4" tee nuts from the bottom.

The filter to donut test fit and tee nut with 1/4-20 round head bolts.   Don't torque the bolts down, it only requires enough pressure to slightly compress the gasket, just get a good seal so air (and dust) doesn't leak out.

The donut in the Jet DC-1100's separator.   You can see one of the four 1" screws holding the donut inside the separator.

The bead of silicone sealer I used around the donut.

And finally the entire unit with the Wynn C1425 filter attached to the Jet DC-1100 ready to test.     I usually work in pine and fir, but you can see a dark ring near the bottom of the sack where I did a project in red oak.   It's interesting how the dust collector can reveal something of your woodworking history.

Here is what it looks like "Down the Hole" while the Jet is running.   You can see whats going on in the separator throat better with your naked eye than this pic shows (due to reflections).   You can just see the inside edge of the donut around the inside of the filter.   Now I can get up on something and look into the filter and separator throat to see whats going on.   I got Betty to throw handfulls of sawdust into one of the Jet's intake hoses while I watched.   The air is moving at about 90MPH so when sawdust does come in, its quick, but note, no build up on the top of the throat.