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The purpose of the pocket-sized fume extractor is to remove all harmful fumes from the air that are created by smoldering solder.  The fume extractor was built using very few parts and simply gets its job done wherever and whenever you need it without requiring an electrical outlet or large amount of space.  

The fume extractor uses a 9v battery to power small 12v fan i purchased from Radioshack and contains only two soldered connections, and so it is an excellent project for anyone who is just learning to solder.  Instead of containing an on/off switch, i built the extractor so that the battery is plugged into its body in order to turn it on while also acting as a stand for the extractor itself. 

How does it work?  The small fan sucks air containing fumes through it, and then blows them through a carbon filter that is glued in place in front of it.  This effectively removes all dangerous chemicals that the fumes contain from the air around you as you solder, thus saving you from a headache as you work. 

Step 1: Gathering the Parts and Tools

For this project you will need the following parts:
-9v Battery (any brand)
-Hard plastic 9v battery clip
-Small hinged acrylic case (mine was bought with shark teeth in it, it's 55mm by 44mm by 20mm) 
-12VDC Micro Fan (http://www.radioshack.com/product/index.jsp?productId=2102824&filterName=Brand&filterValue=RadioShack#tabsetBasic )
-Weller WSA350F Carbon Filters
-Red and black heat shrink tubing (optional; covers your solder connections)

You will also need the following tools/items:
-Soldering iron and Solder
-Super glue
-Dremel
-Fine point Sharpie
-Sandpaper (i used 80 grit)
-Heat gun (if using heat shrink tubing)

Step 2: Mark Before You Cut

Once you have gathered all of the necessary tools and supplies, lay your fan on/in your case so that it is touching its top and trace its outline onto the case using a Sharpie.  Make sure to align the fan as close to the top of the case as you possibly can in order to leave plenty of room for the battery snap and battery.  
After tracing the fan onto the the case on both its the front and back cut out two holes in the case along the lines you have created using your Dremel.  These holes will serve as the air intake and outflow ports for the fan, and both the fan and carbon filter will be sandwiched in between them.  Once you Dremel out your holes, make sure to sand the edges down and remove all plastic debris from the case.

Next, mark the width of your 9v battery on the bottom of the case and make sure you try to center where the battery will fit into the case.  I did not need to mark the length of the battery on my case because its width was the width of the case which i used, and so i simply cut along the two lines i had created for the battery's width and along the edges of the container in between the two lines.  When you're done cutting out the battery hole, your battery should be able to snugly fit into the case right way up when pushed through it.  A snug fit ensures that the battery will act as a stable base.  Lastly, sand the edges of the hole and remove any plastic debris that you may have created.

On an important side note [READ ME] ;  make sure to check that your cuts will fit the fan in the case with a slight overlap on each side so that the bottom of the fan may be glued to the back of the case and allow plenty of room for airflow.  You don't have to be as careful with size when cutting the hole on the side that the fan isn't glued to, because you can cut your carbon filter to fit that hole no matter how it turns out.  I also laid things out after each hole was made to make sure everything fit snugly

Step 3: Soldering and Glueing

After you have cut out all necessary holes in your case, it is time to solder the fan to the battery!  Cut and strip your wires for both the fan and battery clip so that they are short enough to fit in the case without excess wire hanging out.  Then solder the red (+) wire of the fan to the red (+) wire of the battery clip, and solder the black (-) wire of the fan to the black (-) wire of the battery clip.  If you choose to, you may also cover each connection using heat shrink tubing to prevent any short circuits.  

Once you are done soldering, determine which way your fan blows air by looking for a small arrow icon on its side or by plugging in a battery to power the fan.  Next, glue the fan by its four corners to one of the two large holes you cut in the case so that it blows air out the other large hole. This way, the fan can suck air into the case and blow it through the carbon filter and out.  

After the fan is firmly glued in place, attach a 9v battery to the snap and put a dab of super glue on the top of the snap. Make sure to have the battery pushed through its hole in the case, and push the top of the snap onto the side of the fan so that it is glued in place.  The reason why you should glue the snap in place while the battery is attached to it is so that the snap is positioned correctly on the fan.  If you glue on the snap without using the battery as a guide, you may not be able to connect the battery to it through the battery's hole on the case.  Wait for the glue to dry, and then remove the battery.  

Step 4: The Carbon Filter / Finishing Up

The final step in the creation of the fume extractor is to attach the carbon filter to the fan.  First, cut the filter so that it is the same size as the fan.  Next, apply glue to the four corners of the fan and press the filter firmly into place.  Your pocket-sized fume extractor is now complete! Plug in a battery and try it out, just make sure to unplug it when you're done.



Step 5: The Final Product

In order to keep things extremely simple and take up less space, i chose not to add an on/off switch to the circuit for the fan. If you choose to, you could easily attach a SPST switch between the red [positive] wires of the fan and battery clip. I would love to see pictures from anyone who chooses to build one of these, and feel free to ask any questions that you may have. Constructive criticism is welcome too!
<p>Great instructable! I made mine using Lego for the case, hot glued together. Basically 2 Lego frames, front one to hold the fan, back one to hold filter. I didn't have carbon sponge, so I filled the back frame with loose carbon, contained by gluing a fine mesh on both back and front of frame to contain it. This was done prior to joining the fan frame and the filter frame together with hot glue. I wanted to add the battery upright as you did, but it wanted to overbalance :-( Must not have aligned the Lego all that well. I can also use heat gun to soften the glue on the back, remove the mesh and replace the carbon as necessary.</p><p>Works great!</p>
<p>Looks great with the legos.</p>
<p>how to get lots of computer fans for cheap: make friends with people from computer shops and you will get loads of computer fans just for buying him lunch.......</p>
<p>Really nice! You can also name as a smoker. And yeah it's portable..</p>
Nice. It's not the most powerful thing, but it sure is portable :)
Your 'ible looks real nice. Well laid out and easy to follow.<br>I think the only change I would make is cutting the hole slightly smaller on the hinged lid and insure that the fan is glued in place so that it blows through the lid, so that the carbon filter could be wedged between the fan and the lid to keep it in place. This would make it easy to change out as needed, without having to rip it free of the super glue.<br><br>Cheers
I would also put a switch, but I just really like switches, so there's that.
This is great! Of the experince I've had with industrial fume extractors, this operation is reversed. The fan removes the fumes from the air by sucking the fumes into the filter, and the clean air exiting through the fan.
I have one of those cases too! i got shark teeth in it one of the times i went to hawaii.
Catch 22, you need to solder, to protect yourself from solder....
great solution for some, but not for me, I guess you could call be a smoker. I smoke 2 ft. worth of solder fumes every day.
I was just accepting my slow, painful, chemically-induced death, but I might finally build one of these since its so simple. The 9V battery as a base in pure genius, man. Well done.
nice and simple, I like it.
Nice design, I've been thinking about building something like this. You may have inspired me to get off my duff and get to work!

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