Exhaust fan for any enclosure

This is an enclosure exhaust fan you can add to any enclosure, it uses a standard 120mm fan and standard clothes dryer air hose.

The part has space for an activated carbon filter, but with a cheap fan the filter reduces the airflow too much. so I removed the filter (you can either use it without the filter or get a more powerful fan)

The drill guide part has a thing in the corner with holes that fit the screws on the top of my printer's enclosure. you can break this part off (or modify it).

Important notes: Obviously, there's no warranty, if you damage your enclosure don't' blame me. A standard cheap 120mm fan doesn't necessarily have the power to safely get rid of all the fumes in the enclosure. I'm not responsible for your safety. This gets rid of all the nasty smells when I'm printing but if you are working with nasty gasses you need something more powerful than this. This is not airtight and can leak some of the fumes into the room.

Required non 3d printed parts:

• 120mm fan
• 4 M4x35mm (or longer) screws, longer screws will make assembly easier but will protrude from the top 
• 4 M4 nuts
• (optional) 4 M3x15mm (or longer) screws with hex cap heads
• (optional) 4 M3 nuts
• (optional) zip ties

Printing instructions:

• Print the hose connector, housing 1 and housing 2 parts. I used PETG but you can use any material.
  • The two housing parts should be printed with the open side upward
  • The hose connector should be printed with the rectangular part on the build plate and the circular part upward
• Print in TPU - 2 of the gasket part and 4 of the small disc part - the TPU parts prevent noise from vibrations, they are not designed for an airtight seal.
• The drill guide is, just like the name suggests, just a drill guide, so print it in the cheapest material you can use

Assembly:

Note: Please check everything fits before making holes in your enclosure

1. Prepare the enclosure
   1. Place the drill guide where you want to add the exhaust port, secure it to the encllosure, for example by using clamps
   2. Drill one of the small holes in the corners. preferably with a 5mm drill
   3. Use of the screws to connect the drill guide to the encllosure and repeat for the hole in the opposite corner.
   4. Now with the drill guide secured with 2 screws, drill the other 2 holes.
   5. All that's left now is to cut out the large circle in the middle (I used a Dremel, it took a long time and made a huge mess. there's probably a better way to do this)
   6. Take off the drill guide. it will not be needed any more
2. Connect the two housing parts.
3. The side with the circular hole is the bottom, the side with the big rectangular hole is the top. the side with the narrow rectangular hole along the bottom is the front
4. Optionally use the 4 M3 screws and nuts to secure the parts together, there's places on the two sides of the housing
5. Insert the 4 M4 screws from the bottom.
6. Place the 4 small TPU discs on the 4 screws.
7. Place the fan. the screws should fit in the screw holes in the fan. Note there's a slit in the housing for the fan power wires
8. Place the first gasket part on top of everything else
9. Place the 4 M4 nuts at the four corners of the hose connector part
10. Now for the fiddley part, take the housing and place it on the holes you made in the enclosure, the 4 screws should go through the 4 small holes and the big circular hole should fit the circular hole in the gasket, place the second gasket on it, then the hose connector and lock everything in place with the 4 screws
11. Connect the hose, the fit should be very tight. optionally secure the hose in place with zip ties