Shop Air Filter Fume Extractor Combo




Introduction: Shop Air Filter Fume Extractor Combo

About: I am a maker and here I am sharing the fun stuff of making and creating! Apart from fun my goal is to share knowledge and acquire it. My topics are woodworking, metalworking, maybe some composites, electron...

Before we start of:

The idea behind this handy air filter unit was to use materials you can only find in your homecenter. and prefferably you don't need to solder and make intricate wirings and such.

So far i think this has worked out. Let me know if you feel the same!

If you are interested in the schematics and sizing, this is available from my website:

Step 1: Design

So the idea is clear:

Use matererial from the home center and keep the fabrication limited to no soldering and complex wiring.

(I'm going full nerd in the next paragraph, excuse me)

The next step was thinking about other design constraints or challenges. I wanted it to be small, my own shop is small so therefore. And I would've liked if I could hang it like a dust filter cleaner unit and stand it on a desktop/workbench. And while i am at it; make it function as a fume extrator. This is handy for useing lacquer, welding and soldering.

So at first I needed to find and use a fan which doesn't require electronics and could be hooked up to a wall plug. The simplest and cheapest option would than be a 100 mm tunnel fan you put in your toilet for air extracting. These fans have a high flow rate and low energy consumtion (AC synchronous motor) but have a limited pressure capabilities

For the filter material I needed a fine mesh fabric and I came across a 'stove grease filter' material. The stuff which is in your 'extractor hood', 'afzuigkap' in Dutch. And for the fume extracting an active carbon filter.

Step 2: Cutting Stock

The first real fabrication step was getting the wood wheet material to size. I used a mitre saw and table saw.

Step 3: Rabbet Joints

The general frame of the housing is fitted together with a rabbet joint in the top-bottom piece. Those pieces are 18mm (3/4 inch). And the sides are 6 mm (1/4 inch). This way there isn't too much material in the the housing.

Step 4: Housing Assembly

The top and bottom pieces are glued to the thin side pieces. I drove in some small pin nails to help clamping and aligning. This is slightly easier but not required. After the glue has set the front sheet was put on the assembly, with the same procedure. When this was done the whole housing was assembled and when the glue was set it was suprizing sturdy given only the top and bottom are of standard thick sheets and the other parts are thin.

Step 5: Making Holes

So the housing is one piece now. I took one tunnel fan and measured the outside rim of the tunnel. I increased that measuring with 10% and drawn the hole I could saw with a jigsaw. In my cat the holes became 112 mm (4 1/2 inch).

Step 6: Wiring

So there are two fans. Both ran in my situation at 240 V AC. To make them work they needed hooked up in parallel.

If you dislike electrics skip the previous sentence.

So I placed one 2 wire cable between the motors. Hooked it up one side. Drilled a hole for the wall plug cable with switch. Feed that through. Hooked up the wall plug cable with the 2 wire cable in the same slot of one fan. On the same wire colors as the first fan to wire connection.

This way the motors are in parallel. This is similar as you would want to use the tunnel fan when you switch on the light in your toilet.

Step 7: Test

This step is very important.

This way you can validate if all went well. Before you test, check if there are no other machines running or hooked up to the electrical group you want to test the unit on.

Check if you have enough circuit breakers or an automatic one.

And press the switch.

If you worked neatly and safely nothing bad has happend; on to the next step.

Step 8: Support

On the inside of the top and bottom part I glued in a slat of 18 mm (3/4 inch) material to act as a support for the filter material and frame.

Step 9: Frame

The filter material will be secured via a retangular frame. This frame will be screwed on and 'clamp' the filter in place. The frame is made via a simple halflap joint glued in place. Screws or nails can be added as extra, this is not required.

Step 10: Filter Material

So the grease filter and the active cabon filter come in this fabrics or sheets. They need to be cut larger than the frame to be properly secured in place.

Step 11: Filter Assembly

As said earlier the frames are screwed into the housing. There where the support slats were glued in place. Four screws will do the job fine.

Step 12: Finishing

This step is totaly not important and only for your own visual comfort. I painted the MDF sides green.

After that I glued on 4 small blocks of wood to act as feet. On the front I put a cleat to be able to hang the unit to the ceiling.

And that concluded the Air filter unit. I have a video testing the fume extracting capabilities:



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    13 Discussions

    Thanks! How much did you pay for the ventilators?

    I'm also curious how expensive active carbon is since from what I've heard you need to replace it rather often.

    1 reply

    Hi thanks! well the filter cost me 10 euro's and i can make two sheets out of that for this build. I made a few of these for a customer factory, and they change the filters every 2 two weeks so about a good 80 hours of 'on' time.

    This is an awesome video. The tunnel fans would never have occurred to me to use. I plan to attempt to make this soon.

    1 reply

    Hi Perilla, Thank you! sometimes simple solutions are right in front of us!

    It took me 3 to 4 times of rethinking what kind of fans would be suitable.

    very nice good job. what was your total cost of every things. thanks loner

    1 reply

    Great design and very simple. You can almost make a laminar flow hood when operating in reverse if using a more thorough filter like a HEPA filter and maybe even some other sterilization processes (UV/Ozone/Electrostatic) in the box. Most don't grow mushrooms, though this would of been handy back when my family was growing shiitaki, maitaki and some other fungi. You could also add a glove box for chemical/biological work. Now days I like your design for soldering.

    I am guessing the filters you made are more cost effective than purchasing? Otherwise, like someone noted below... furnace filters may be helpful though not so chemical/element vapor absorbing is my thought.

    Thanks for sharing!

    1 reply

    Hi james thanks! those additions could be very useful thank you fro sharing! yeah the filter material is quite cheap, ofcourse filter could give more flow and more filter capacity but both options will do the job.


    10 months ago

    I made a similar filter box. Framed out a box with a slot for a furnace filter and cut a hole for a shop vacuum hose. The outlet from the shop-vac blows into tubes of footer drain pipe mounted high. The intent was to filter a curtained paint area. I have actually never used it yet (lol), but in testing, the space did warm up more than expected. A better fan system may be made, but this is intended for very occasional use.

    1 reply

    ok cool, yeah the whole thing is quite simple, only a box with a filter.

    Hi all, This is another project. In my opinion a smart combination. Usually fume extrator and dust filter aren't combined. Let me know what you think. Happy to hear feedback !