- Using a pair of scissors, cut out the drawn shape as shown below.
- What remains of the plastic lid is now the computer fan dust filter frame. Position the frame over the air vents. All the air vents should be exposed inside the frame.
- Take an old stocking piece and place over the computer fan dust filter frame as shown below.
- Cut out a piece of the stocking that extends beyond the edge of the computer fan dust filter frame.
- Put the cut piece over the computer fan dust filter frame and stretching it a bit.
- Invert both the computer fan dust filter frame and the stocking piece and lay it on the table. Fold a point along the edge of the stocking towards the inside of the frame.
Cut a piece of masking tape and fasten as shown below.
- Move to the opposite point on the frame and do the same. Ensure the stocking piece is stretched a bit with minimal wrinkles or slack.
- Continue taping the rest of the stocking edges to the computer fan dust filter frame. Avoid covering the screw holes with the masking tape.
- Invert the computer fan dust filter so the front side of the frame is facing up.
- While holding the computer fan dust filter with one hand, punch the stocking material using a nail with the other hand.
Pierce the stocking material where the screw holes are located.
- Ensure the pierced holes are loose and big enough for the screws to pass through without snagging or pulling much of the filter material. This is essentially the completed computer fan dust filter.
- Position the completed filter on the cover panel. Note the air vents are clearly visible even with the filter material on them.
- Install the computer fan dust filter on the outside as well as the air-intake fan on the inside. When turning the screws with a Phillips screwdriver, hold the filter material with the fingers on one hand.
This prevents the filter material from getting snagged and then turn with the screws as the screws are turned.
- Here's the completed desktop computer fan dust filter as installed. Notice the screws do not pull much on the filter material.
- Here's my computer setup. The screen monitor has been moved aside for the photo. Ensure there is ample space in front of the computer fan dust filter so there is free air circulation.
Finally, you may want to tape a couple of air-flow indicators where the power supply and exhaust fans are located. I used pieces of light yarn and frayed them at one end. This lets them catch the air blowing out from the fans.
Before, I had to stand and feel the air coming out from the vents with my palm. Now, I just lean over to the left to see if the power supply and exhaust fans are working.
An improved version for a cheap homemade computer fan dust filter here.